Damn dude, do you kick skydiving coaches in the balls when you see them in person too?
The cheapest and fastest way to get good at any discipline is to get coaching. It feels more expensive at the start, but it's not. In the long run you'll get where you're trying to go in far fewer jumps and having spent less money. The same is true for tunnel time.
Your strategy of, "wait until a coach isn't working and then try to leech some information/coaching/jumps out of them in exchange for a $5 beer" is insulting...at best. At worst...it's damn near theft.
A lot of good people make a living by helping other skydivers become better. I'm sure they don't appreciate you telling people that their services aren't valuable, and that the best course of action is to try and undermine their livelihood.
Coaches are valuable, and important, and worth it. Their services are valuable, and should be respected as such. Jumping with an LO is NOT the same as working one-on-one with a dedicated coach.