Drowns out any interesting or meaningful discussion for the most part unless the gimmick is creative and witty. Sadly, most are not. 
This. We don't want "fluff" clogging up the forum and we also don't want one person simply talking to himself. That shit looks crazy when you realize what they are up to.
Other reasons as to why we don't condone gimmick use are:
When some people employ the use of a gimmick account, it's because they want a deeper layer of anonymity that would allow them to say the things that they wouldn't like their main account to be associated with. For instance, you're on the fence with regards to how you feel about a certain member, but have never had any direct confrontation with said member, in turn, you ramp up the old gimmick account and attack him/her a bit to see where their breaking point is. Conversely, you use the gimmick to befriend said individual, but keep the allegiance limited to that of gimmick use.
You can also create gimmicks to imitate real people (Wes Gasporotto comes to mind) and that is not allowed, for as it can bring about problems for the real individual.
You can also create gimmicks to bring about havoc to the site. You use the gimmick to flood the forum or destroy threads, knowing very well that only that gimmick account will be banned/deleted, while you can always go home to your main account.
These are all things we are trying to avoid. There have been some members that are highly talented when it comes to working with their own gimmick accounts, but the vast majority of members don't have that level of tact when it comes to that kind of thing (most personalities and/or writing styles/grammatical mistakes tend to seep right through sooner or later).
Happy posting!
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