(...)Well that isn't exactly true as gaining skills/gear does make you "more powerful". Its just the scale is much lower then one would think, or that's at least what I am led to believe.
I'm going to quote what Prometheus responded in another thread here:
Prometheus said in Mega Update - Cheaper Packs, Pre-Alpha Keys & More:
(...)As long as you still have limited sources available, you'll be looking for those, since unlimited sources are rare and/or give much fewer points. Unlimited sources matter only once you've run out of limited. At that point, however, your character is likely already dozens of hours old, has unlocked all the 50 talent points and has a good variety of builds available - it can be considered "done" from a "competitive" standpoint. (...)