Ah...blazers. Well, you and I have the same problem.
I love them and haven't been wearing them either, for weather-related reasons and work-life related reasons. I mean, when it's so cold that only layered knits will do, only layered knits will do! And when you work at home, a blazer provides more structure than is really comfortable or needed.
So...I don't know. I have just reconciled myself that I WILL still buy them and will wear them on my big-city jaunts....because I love them so. Which sort of goes to Anna's thread about practicality vs. love of something. I am pretty much in your camp -- function is part of high happiness factor for me. But when it comes to jackets, I just can't help but love them, whether I need them or not.