I only go anon on certain questions, since the last time I answered I got some unsolicited PMs. I'm conflicted, because there are some that give genuinely good opinions as anons... but then you do have a lot of trolls, too. I would like to limit the amount of nonsense questions, like the ones that take advantage.
I have being thinking about this and I think there should be no limit - We both know people with very high Xper totals who choose to answer most questions anon preferring to stay low profile. Once your anon answers are not offensive what problems are you causing. The short xper grabbing answers will always be around anon or not.