I wish there was an option to just buy the ebook for $10 or something. I would very likely have bought it instantly if it was an option. As a college student $39 is a bit steep, especially when I can't find any external reviews.
It's hard to find a balance, I'm not 100% positive if this is the right pricing for it. But, like the sibling poster mentioned, I offer a full refund and you can always sign up for a free sample—it also adds you to the mailing list wherein I share some useful info for free.