I am working for 3 private investors. Is it ok to sell the same leads to all 3?
Nothing wrong with selling leads to as many investors as you wish. There are National companies that do this every day over the internet. They also sell exclusive areas to investors and to sell others these leads to others would be in violation of their contract. If you get some super leads why not buy yourself or get partners or get under contract and try to wholesale for more income.
I’d bet your investors would pay more for an exclusive lead though! You could always ask them to let you know if it didn’t work out and then send it to another investor.