CoinUploads is a file hosting service, like MediaFire and RapidShare, and you set a fixed price for the file you upload, so I don't think I can charge 10 times the normal price. Here's the main site.
http://www.coinuploads.com/I looked up the definition of "gambling," and this is what I got on The Free Dictionary.
http://www.thefreedictionary.com/gamblinga. To bet on an uncertain outcome, as of a contest.
b. To play a game of chance for stakes.
2. To take a risk in the hope of gaining an advantage or a benefit.
Also, the board description says "Gambling and all "investments" that are so risky they might as well be gambling." Maybe my "business" is not all that risky, but I think it still fits the definition of the term "gambling." I also put it on Gambling to try to emphasize that there's a "game" aspect to it.
There's millions of public domain books out there, and it's probably impossible to know about millions of anything. So you'll likely find books that you would never have known about otherwise. It might be a book you wouldn't normally give much attention to otherwise, but maybe in the best case, you're pleasantly surprised at the information you didn't know would be interesting to you.
Paying 2 dollars and seeing what the book is and has in it, would that be fun? Should I give you hints as to what the books are?
Are you people here rich? In terms of dollars, how much money do you have? If you're not rich, do you know of anywhere where there's rich people?