I know! But I always bog myself down with moralistic, philosophical questions like "is that how they got started?" and "does that make me as loathsome as them?"
Questions they I doubt they ever felt the weight of.
Most of them got started with generational wealth. Be careful though. The only crime the rich people get in trouble for is stealing from other rich people.
Just send them official looking bills with obtuse language describing the billed work. Many will just pay them without looking further into things. I once did a landscaping delivery to some nouveau riche looking a-hole who bragged about being so busy and rich, that he just payed whatever bills came in. He also wasn't that rich, but liked to look the part. Probably swimming in debt right now.