I've noticed that the more anime I watch the shorter my attention span is for the anime that I've seen. I lose interest in an anime title faster than I did a year or two ago.
When I first began watching anime twelve years ago I liked a lot of the anime I seen. I would have collected from most of them if I earned more money and I would have still felt like collecting from them even a few years after I saw them.
Nowadays I'd only feel like collecting from a several of the shows that I watch every six months because I'm comparing the shows I recently watched to all the other shows I've ever seen. Now even for the shows I recently watched and initially felt like collecting from I could easily lose interest in two to four months after I watched them.

I still have favorite or top priority anime that I'd like to collect, but the window of collecting interest is shrinking. In a way it's good because I spend less, but it's not so good when it comes to maintaining collecting interest.
How is the situation with you guys? Does your anime title collecting interests always stay the same or does your interests change all the time?