It'll come back to bite ye.
It's widely known and accepted that if Debian has a weak area, it's installation.
Once you get the thing on (and it's really not all that bad), Debian basically whips Red Hat in every area.
Easier to use. Easier to install software. More software. Better configuration. You can upgrade without nightmares.
The kicker: [link|http://www.debian.org/doc/debian-policy/|Debian Policy]. As far as I'm aware, no such document exists for any other Linux distribution. Policy is the special sauce that means Debian is better. Not just subjectively better, but objectively better - there's a metric for measuring the "goodness" of a package, and that's to what extent it complies with policy.
Red Hat might have the slick installer, but that's no basis to choose a distribution. You're going to spend a day or so with the install. You're going to spend at least months and possibly years with the consequences of that.
Yes, there are reasons not everyone runs Debian. They're almost invariably wrong :)