Most cats and probably half the dogs I have known were free, and cost under $200 in today’s value of currency to neuter and vaccinate, total, while supplies (litter box, dish and a few toys) came to way under $10 total. Litter is as cheap as dirt, and dirt can substitute. Cat food and dog food can be had very cheaply. They also eat table scraps (careful about fish and chicken bones, chocolate and anything with caffeine or high in sugar, the little livers aren’t designed to graze like ours are). Pets are cheaper than alarm systems for the home, weapons for self-defense, gym memberships for encouragement to work out, and heat in winter, all of which they at least partially substitute for (well,a cat will lose all respect for you if you use him as a self-defense weapon, but the rest they will be happy to do.) They also provide peace with another species, that is, a little bit of peace with nature, and sweet pure simple companionship. Unlike human companions, cats and normal dogs don’t turn on you, expect more than you can give or use you to get back at someone else etc. They don’t care how you look, don’t lose respect for you as a provider if you have a small dwelling or shabby furnishings, or measure your relationship by status symbols, for they have a simple, realsitic view of how good they actually have it just to be indoors and fed every day, and thye know the one who hunts the best is the boss, not the one who plays social games the best. They’re honest and affectionate because that’s who they really are.