One piece of advice that I've seen people learn painfully.
If you're going to name a high price to do what you don't want, make sure that the price is truly high enough for the grief you'll suffer. Don't just name something that is high enough that you think they won't take it, because they just might.
This. This a thousand times. If you could travel back in time about 4-5 years ago and drill that into my amateur starting-out self instead of leaving me to learn it the hard way, that'd be great. Thanks. I'll pay you generously out of the net increase in proceeds arising from adoption of the advice.
If you're going to name a high price to do what you don't want, make sure that the price is truly high enough for the grief you'll suffer. Don't just name something that is high enough that you think they won't take it, because they just might.