Take out taxes and the agent's cut and 100k isn't that much. Also, bear in mind that most NFL players way overspend. Combine that with the fact that players who only make the practice squad will probably be completely out of the NFL in 1-2 years and it isn't that great at all.
If you want to make it in the NFL, you should bust your a@@ in college in the weight room and on game day, perfect your craft through the end of your senior year and then go pro (when you're completely ready to compete at the next level).