I had problems with people reformatting [1] my RSS feed (Rich Site Summary) [2] but it appears that other people [3] have problems with RSS (Rich Site Summary) feeds but for another reason: unintentional content stealing.
Granted, if you make an RSS feed available, with the full content of your site available odds are people will take advantage of this in ways you may not have intended, up to making it available for other people to read. The person [4] in question did not know the software he was using made an RSS feed available and was shocked at finding his content elsewhere (but that republishing of his content has since been removed).
[2] https://boston.conman.org/bostondiaries.rss
[3] http://www.blogroots.com/comments.blog/157