The difference in Cat5 and Cat5e is the twist in the wires per foot, and the ability to transfer at 10/100 Base and 10/100/1000 Base. If you have somewhat old network cards and routers/hubs, you wont have the ability for 1000Base so it doesnt really matter if you have Cat5 or Cat5e.
eh, given the right buyer you may get the $50 for it. and if it was free, its all profit then isn't it
heck, the network cable will sell for about $5 or $6 a package at some stores (i know there ARE better deals though). and most places, homes and business, can't utilize CAT5e or CAT6 yet. your network is only as good as the weakest link and cables usually aren't it in my expirence.