there are about 275 daily Masses (if no Saturday Mass) and from 50 to about 200 Sunday Masses each year and one Mass each Sunday must be offered for the intentions of the people of the parish. that leaves from 400-500 Masses which can be offered for other intentions, usually for deceased of the parish, or of families of parishioners at their request. Sometimes a nominal donation is accepted and if it is the priest is bound to say the Mass promised for that intention. We had about 100 funerals last year, and most families ask for a Mass to be said a year later on the anniversary of the death, so that leaves about 300 Masses which others can request for their deceased loved one. Priests are not supposed to accept donations for multiple intentions for one Mass. Usually the names are not mentioned during the Mass, but should be published in the bulletin or elsewhere. Our parish secretary opens the book for next year at the beginning of December, and it is usually full by the end of January.
There is only one priest in the parish, so there is a limit to how many Masses he can offer for individual intentions.
There are many other ways to request a Mass prayed for your deceased loved on or other intention. There are many orders of missionary priests who willing offer their Masses for intentions of the faithful, and accept donations to further their missionary work. Any Catholic magazine has ads and listings of these orders. A small donation also brings a lovely card or memorial to send the family of the loved one. there are retired priests in your diocese who say Mass every day and would love to pray for your family member.
this person used this incident as an excuse to leave the church, it was not the real reason.