Procedures and possibilities vary greatly from one country to the next, making it difficult to offer general rules. There are often ways to sell a bike locally, but only rarely will you get what it's worth back home--that's because selling is seldom (if ever) totally legal, and the buyer is assuming a measure of inconvenience, risk, and/or expense. Basically, wherever you go you'll be riding under a temporary permit which requires you leave with the bike--countries differ regarding the means and severity of enforcement.
At the risk of sounding like a broken record, I'm going to suggest that you use the search function (upper right on this page) to do some basic research. You'll find that many of your questions have been addressed exhaustively in the recent past, both in general and in specific terms.
Hope that's helpful.
Mark
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