Okay. First, there ARE machines at some CTs and some grocery stores. However, most of these machines take a 10 to 15% cut. You are just giving your money away.
I bought something similar to this:
http://cgi.ebay.com/Ultra-Coin-Sorte...-/350265211593
Took 5 minutes to roll my coins this morning and got $268 when the bank opened. I'd be out $26.80 if I used a machine that took 10%. One use about paid for the coin sorter I bought.
Note: Most banks will NOT take coins unless they are rolled.