My biggest problem with buying books is cost. I can go through 4 to 6 books in a week, publishers have pumped the price of new books to a level I can no longer afford. 
So what's the answer? 
While any writer would be foolish to ban his or her books from a library, if only libraries bought your books, you would need a second job.
The answer is a modified version of "if you can't beat them, join them"
Investigate the business model of the Caen Free Press. Offer downloads of your books at a realistic price. You have mentioned book trading on the web, but if you leave the web and head deeper into the internet, Internet Relay Chat is a veritable paradise of o2p file sharing.
The problem you are faced with is making your product easier to pay for than it is to steal.
ABE books and amazon are fine, but are ultimately a pain to use and navigate around. Amazon in particular has outgrown its original remit to the point that a search for "archer" will return bows and arrows.
There is an answer, but it can't be fully detailed in a comment like this. You have my email address, feel free to use it - I'm selling nothing, ideas and conversation is free.