Not a silly question, but one that has been asked often...
Often enough that we've got a sticky (or two) for people to read who ask this question. Take a look here: http://www.ipadforums.net/ipad-hacki...ed-2011-a.html
In addition, have a browse through the other stickies there. Hopefully, as you read about various tweaks and such that others have on their iPads, you'll see reasons why you'd want to jail break yours.
So, grab a snack and a beverage of your choice and have a read. Enjoy.