I hate to rain on your bonfire, but here's what you're up against to profit from this: I took your two examples & threw them into Amazon (UK):

Quest for Adventure by Chris Bonnington (Paperback - 19 Sep 1991) 23 Used & new from £0.01

Return to Go (Hardcover) by Jim Slater (Author)

12 used from £0.25

So besides the critical mass issues raised by other commenters, your information providers would have to be either cheaper, more experienced (neither realistic), or somehow provide a far richer experience than these two well-regarded examples. That's a big hurdle & it doesn't scale well.