No, no it isn't.

It's actually quite frowned upon and unethical.
I'm with you bro. If you trade accounts or invites you better put them to use. I don't see the point of just getting accounts or invites to trade for something else. I mean look at the IndieTorrents thread. How many of those that wanted it really needed it. Isn't these just a indie tarcker or does it have English content as well?