A guy in one of my classes at school went to school with a guy who started his own shit picker upper business. He made this little vacuum cleaner thing with a bag and went around to people houses asking if they needed shit picked up. Supposedly he is a millionaire now from the business.
Think about what you could do with what you have picked up, its fucking shit... bag that shit and sell it to old ladies who want to fertilize their gardens and shit so you dont need a place to dispose of it. If its true, its just one of those quirky things that people are too lazy to do.

People who own nail salons always seem to be pretty wealthy.

Cigar bar, I know there are a lot of people who like to smoke and kill themselves so why not cater to the ones with more money? Have a bunch of cigars ranging from $5-xxx amount each, serve beer and wine and such, nice leather couches and chairs. Sell all the little fancy zippos and "cigar accessories" Have attractive women working in it. Tell them to wear all black and hire the ones with large breasts. Lastly, hire some crazed old man to come in, set up his own equipment and play jazz, or something that no one understands b/c its "deep and meaning full" and your all set. I mean what businessmen wouldnt want to go hang out there after a hard day of banging the secretary, and talk about money and avoiding taxes????