I guess that depends on the motivation of the coach/instructor. My husband is a USPA AFF IE and coach examiner and a Master Rigger with a shit ton of experience. He is happy to talk with, advise, pass on useful information to anyone... for nothing. A beer is a nice offering but not required. He doesn't need to be paid to share what he knows with others. It's not about his pocketbook, it's about helping people become better, safer and more knowledgeable skydivers. Not to mention that it makes newbies feel like they are a part of the dz and not a wallet to empty.
I know I'm a dinosaur, but I think It's pretty sad that jumpers now expect to be paid to talk to newbies.