Handed over 6 addresses and the investor bought one without me
I spent three weekends driving two older neighborhoods on the north side of my city, writing down houses with tarps, dead grass in July, mail piled in the box. Ended up with six addresses I felt good about. Pulled owner names off the county assessor site for free, no skip tracing, no phone calls.
Sent them in an email to an investor I met at a local meetup. He replied "thanks, will look." Three weeks later I drove past one of them and there's a dumpster in the driveway and a permit in the window. Checked the recorder's office and the deed had transferred. He never called me back and I never sent an invoice, because there was nothing to invoice against. No fee agreement, no email saying what a lead is worth, nothing. Just a list of addresses I gave away.
What I'd do differently: get the fee in writing before the addresses leave my hands, even one paragraph in an email he replies yes to. And send one address at a time so I can tell which lead did what. A list of six with no agreement is just free research for somebody else.