If it didn’t matter how lucrative it was, then I would do something to help homeless and feral cats (and maybe a dog or two).
If I wanted something that could sustain me as far as having an ample income, I don’t know because regular businesses seem to not always flourish. I would love to own a bookstore, but with Amazon and other online purchasing, I don’t think a bookstore would be too profitable. Same with a florist. I think a florist would be a lovely business but it would not survive. I’d love to do something with crafts and sell them, but that’s sold a lot on Etsy and places like that – in person, unless you are in a tourist area, I don’t think it would do too well. So to answer the question, if it were supposed to make me a good living, I have no clue.