The vast majority of users (like >99%) don't have a clue why their computer isn't performing up to par. They literally have no idea how any of it works. They might just assume that it's slow because they haven't deleted spam emails in a while (even while they use gmail) or didn't pay extra to get that 3.2Ghz machine instead of the 3Ghz. They certainly don't have any idea how to open up top stats and check what resources a particular app is using, so until that happens and users punish developers for this kind of stuff, expect it to continue.