Not that I'm trying to flog my book, but I don't see much merit in only having the FAA Basic Rotorcraft Handbook as the only reference. Wagtendonk and Croucher have also got great books that would be a worthwhile addition for study.
As for the rest of the stuff, it's all freely available from the Feds.
Having looked into doing this sort of thing myself, it was going to be a tough sell even at a lower price than the one shown here.
Like you - I'll be watching to see what the replies are.