Yes, I do.
Had recently a lot of time wasters who have come for advice, then come back with more questions and then back again and yet have never spent a cent with me.
had one very recently a local service, so we did an audit, there were a shit load of issues and errors, so when I said we'd need to sort these first the reply was I want to focus on the off page.
Initially this guy was going to spend $2k a month, then dropped to $1k and still has not purchased anything.
I'll probably end up using that audit as a case study in the near future.
I now charge a consult fee to weed out these tyre kickers and then we deduct a % off that off their first month service.
I've had link buyers from here spend a couple of hundred over 6 months then ask me to run audits and competitor analysis etc. I reply, sure, I'll send you the invoice then we can start.
You'd not ring up a local plumber to pick their brains on how to fix a leak, then repair it yourself.