I am glad my ugly games are there to help!
There are so many good reasons to offer them, but Community copies also do some counterintuitive things:
1. By giving away free copies I can, perversely, charge more for the pay copies. If you can afford $5 but not $15, you take a community copy. If you can afford $15 and I'd priced for $5 people then I'd be getting less money and the people who couldn't afford $5 are still cut out of the loop.
2. About half the angry/threatening contacts I get include some version of "And I'm going to take your PDF and put it on a download site where people can get it for FREE." I can be like, dude, the game is already free for anyone who wants it.