Wyvver: So far I've only played at the "kiddie tables" ($5/$10NL) and raising TT in an unraised pot is a necessity. Especially when there's 4+ limpers to me.

The reasons include (and these are based on my observations at micro-stakes).
1) Chances are very good you have the best hand, and those who limp in with a better hand (JJ+) are either trying to trap (AA/KK) or more scared than you are of overcards (JJ/QQ). You always want to build the pot when you're ahead. (At these stakes, at least).
2) If someone is trying to trap you, or has a better hand they will substantially reraise preflop and then you can play "set or fold" or just fold.
3) You have sent a strong signal to the table that you have something good. (Which you do!).
4) It makes it harder for those who are paying attention to put you on hands. I'd guess that the average player would think (if they thought about your hand) that you have QQ+ or AK.
5) It's an easy (i.e. inexpensive) way to try and up your aggression post-flop. Or, at a minimum, build your post-flop game.

Good luck