My Ex FukBuddys's husband was broke and basically started a basketball camp business with his wife.
He started off going to basketball camps and being a volunteer getting paid $10 per hour. He was good with kids and also was an ex basketball player in college so he started off with a couple of kids. Basically the kids parents would ask if he could teach their kids basketball. He started off doing 1 hour sessions teaching the young kids basketball and charged $40-70 per hour.
Pretty soon word of mouth got aroud the neighborhood and parents would call the guy asking if he could do an hourly session with the kid on an outdoor court or at a gym. About a few months later, he had so many kids that he started having his own basketball camps and he would charge $100-$120 per kid for a 3-4 hour per day (one week) camp during winter, spring break, summer. Also he hosts 3 hour clinics on sundays charging $100 per kid. His clinics usually have around 20-30 kids (so that's $2000-$3000) on a sunday, then he pays the rental costs for the gym and $13 per hour for the 4 or 5 volunteers for the clinic, so he makes about $1500-2000 for whenever sunday he feels like doing a clinic, he still has his sessions with kids who still want one on one help and when he has one of his holiday camps, he'll have 50-100 kids, so say he charges $100 per kid, and 70 show up, he makes $7000 during the week, minus maybe $1000 to rent for a week and then another $1000 for volunteers, he make about aa $5000 profit of a weekly camp.
Him and his wife started the business and now it's pretty popular in this rich part of town that they live in and they are looking to expand to other neighborhoods. He makes good money doing that and doesn't have to work his ass off, also he's doing something that he likes.
It's mainly profitable because of so many kids that want to play basketball, it keeps them from beiing bored during the holiday season, the parents out here are willing to spend that kind of money for their kids hoping someday that they become the next superstar to make it.
Oh yeah, the business is doing so well that the YMCA and the School district is actually looking to help them expand their business, all this in just under a year.
In the future since I have a basketball background, I may duplicate this business idea since it is so easy to copy and is VERY profitable.