Another great example: 37 Signals. Their product BLOWS!!! It's the web circa 2003. And yet they make so much noise that people still buy their shit anyway.
I personally find the way 37signals promote themselves to be often distasteful, but I still pay for Backpack because it does what I need it to do, and almost nothing more.
Sure, some of the interface and features feel a bit dated, but no other similar service I've tried is as simple, elegant, and devoid of unnecessary, distracting, fiddly bullshit as Backpack. Honestly, is the fact that it's not a trend surfing web developer's wet dream preventing it from being a useful tool?