Nope -- most of the stuff posted here is developed by people in their free time and/or for personal use.
Some people do post e.g. Paypal links in case you want to support their efforts (several calibre plugin authors do this), and Ixtab's Kubrick LiveCD for repairing bricked Kindles has a link to the Laos Literacy project (his preferred form of thank-you)... but far more of the hacks here do not come with any such option.
So unless barsanuphe logs in and replies for himself, it is safe to assume that, for him, it is enough to know people find it useful.
A lot of the time, and for many people, that (knowing our contributions are valued and appreciated) is reward enough.
