Astral/H3X
Member
That's a really good question. It was May 2012 and I'd been on the Diablo 3 hype train since being a little kid playing the shit out of 2. It really came down to me wanting to have a completely new rig for the moment of release. Still using the keyboard and the rest of the rig to this day.
Mechanical keyboards don't really solve "problems" any more than, say, a convertible car solves problems. The reason people get them is their long lasting life (without the annoyance of continuously harder to press rubber keys), comfort, and satisfying feel. For people who type all day and work at the computer, it's a nice comfort/luxury purchase, and many of us end up buying more and more to suit our tastes.
That being said, yes, "feature wise", a $20 keyboard would work well enough.