I've seen many of these threads while I've been on Rootschat. Maybe it is time to 'fess up!
I have been researching my tree for over 25 years and have over 8500 people - that is not deliberate, it is just where my research has taken me.
I research my direct line and siblings plus descendants. I would consider them to be blood relatives no matter how distant - I do also research step lines because they are closely connected and tell part of the life of my ancestors. I have benefitted hugely from taking this approach - if I hadn't I would have missed out on:
1. A photograph of my 4xggrandmother who died in 1861
2. A grammar book belonging to my 4xggrandfather with his copperplate handwriting
3. The date and time of birth of my 3xggrandfather - neatly written by 4xggran in the back of the above grammar book
4. Strong friendship with distant cousins one of whom has spent Xmas day with us for the last 3 years.
5. A family get together where there is a wonderful group photograph of the eldest (96 years) holding the youngest (6 weeks)
These are just my top 5 - if I'm a name collector I'm happy to be one!!

- so don't judge people. I've had my tree "annexed" and seen other incorrect information linking to my tree - but I know that I've researched the information as well as I could at the time. And if it's wrong, tell me!
Jean