There's a actually an established term for most of your list: Early Adopters. A marketing euphemism for people who waste their life and money trying out products you throw at them. It can be fun, but when I see people on Twitter with that term in their bio, I can't help but facepalm.
And then there's another group of people - those who tune their tools forever.
Both obsessions are incredibly common on HN. One harmless case in point, this submission on the front page left me clueless:
http://news.ycombinator.com/item?id=4012862
How many people on this planet have that many management duties that exchanging all stock apps is worth the time? Is it a Zen garden thing? (Sorry author - I have actually at half of those apps too :) )