Afraid not - Consulting is a sales rep's job, pretty much. If they're an employee of a business, they get paid an hourly rate either way, if they're the owner and working the sale room floor, they'd generally average it out in their sale prices. 

I get where you're coming from, I don't sell appliances or anything of that nature, but I've had a few buyers wanting comprehensive assistance where at a certain point I feel like a free tutor -  to monetise that specifically, though, you'd probably have to write a book or a series of guides somewhere (paid or free) so the time is only put in once, or if they are consistently unique questions / answers, find somewhere to point them to that they can learn independently.