I currently have 89 on my phone. I used to have ~115 but, due to space constraints (16GB phone), I've recently been deleting ones I no longer use or don't see much purpose in keeping around.
Just did a restore as new to 6.1 and only added back in the ones I really use daily. But my iTunes folder has well over 100. A lot of them were impulse buys - like how many file managers do you really need?