This is about Church attendance, regardless what the Church looks like on the surface. That’s another thread. A Church is only a Church when the Bishop has declared it one, and only a priest may approach the altar. Someone brought it up earlier about the difference between a Mass outside of Church and people who simply worship on their own believing that is sufficient.
What we offer to the Lord must be from among the best of what we have, and if we are fortunate to afford the best, then we must give the best, including the building of a home worthy of Our Lord. Fancy Churches exist because the money was there to build the place, or in the case of many older Catholic Churches, people donated their own time, treasure, and labor to build it. I can speak from that experience, and I’m sure you would do the same if you had the opportunity. If you think God is not pleased by this, then you must also believe that He is not offended by a building that just has the bare minimum needed for a Mass, while keeping the best of what we have for ourselves. God has already told us that this is, in fact, not true:
‘In the course of time Cain brought some of the fruits of the soil as an offering to the LORD.
But Abel brought fat portions from some of the firstborn of his flock. The LORD looked with favor on Abel and his offering, but on Cain and his offering he did not look with favor. So Cain was very angry, and his face was downcast. Then the LORD said to Cain, “Why are you angry? Why is your face downcast? If you do what is right, will you not be accepted? But if you do not do what is right, sin is crouching at your door; it desires to have you, but you must master it.”’
~Genesis 4:3-7~
" 'If a member of the community sins unintentionally and does what is forbidden in any of the LORD’s commands, he is guilty. When he is made aware of the sin he committed, he must bring as his offering for the sin he committed a female goat
without defect. He is to lay his hand on the head of the sin offering and slaughter it at the place of the burnt offering. Then the priest is to take some of the blood with his finger and put it on the horns of the altar of burnt offering and
pour out the rest of the blood at the base of the altar. He shall remove all the fat, just as the fat is removed from the fellowship offering, and the priest shall burn it on the altar as an aroma pleasing to the LORD. In this way the priest will make atonement for him, and
he will be forgiven.
~Leviticus 4:27-31~
Now, what does Jewish Law have to do with Christians today? Well, take a look at how God planned it for us…
He was despised and rejected by men,
a man of sorrows, and familiar with suffering.
Like one from whom men hide their faces
he was despised, and we esteemed him not.
Surely he took up our infirmities
and carried our sorrows,
yet we considered him stricken by God,
smitten by him, and afflicted.
But he was pierced for our transgressions,
he was crushed for our iniquities;
the punishment that brought us peace was upon him,
and by his wounds we are healed.
We all, like sheep, have gone astray,
each of us has turned to his own way;
and the LORD has laid on him
the iniquity of us all.
He was oppressed and afflicted,
yet he did not open his mouth;
he was led like a lamb to the slaughter,
and as a sheep before her shearers is silent,
so he did not open his mouth.
~Isaiah 53:3-7~
The next day John saw Jesus coming toward him and said, "Look, the
Lamb of God, who takes away the sin of the world! This is the one I meant when I said, ‘A man who comes after me has surpassed me because he was before me.’
~John 1:29-30~
“I am the bread of life. Your forefathers ate the manna in the desert, yet they died. But here is the bread that comes down from heaven, which a man may eat and not die. I am the living bread that came down from heaven. If anyone eats of this bread, he will live forever. This bread is my flesh, which I will give for the life of the world.” Then the Jews began to argue sharply among themselves, “How can this man give us his flesh to eat?” Jesus said to them, **“I tell you the truth, unless you eat the flesh of the Son of Man and drink his blood, you have no life in you. Whoever eats my flesh and drinks my blood has eternal life, and I will raise him up at the last day. For my flesh is real food and my blood is real drink. Whoever eats my flesh and drinks my blood remains in me, and I in him. Just as the living Father sent me and I live because of the Father, so the one who feeds on me will live because of me. This is the bread that came down from heaven. Your forefathers ate manna and died, but he who feeds on this bread will live forever.” **
~John 6:48-58~
And he took bread, gave thanks and broke it, and gave it to them, saying, “This is my body given for you; do this in remembrance of me.” In the same way, after the supper he took the cup, saying, “
This cup is the new covenant in my blood, which is poured out for you.”
~Luke 22:19-20~
This is not about worship. It is about sacrifice. They are not the same thing, and should never be treated as such. This is the Catholic understanding of the Mass. I hope that made sense.