I'm in two camps about rolling your own.

I like to roll my own in some cases becuase I enjoy learning new stuff, and its kinda fun in a geeky way.

OTOH there are some cases where I just wont. For example, I wouldnt even bother thinking about rolling my own CGI.pm because it has been so extensively tested.

And then there are things which are above my skill to do at a level as well as things that are already out there.

Of course as my skill increases, I reserve the right to change my opinions.. :-)