I have cut down on the buying of bikes. I will still buy if it is a good deal especially if it isn't my size then I don't have any remorse when I sell it. My own collection of riders is too big right now at 16 bikes. I plan to thin the heard by at least a few. My usual problem is selling then buying something else later. Since I started a new lbs job I have been thinking of a new modern bike, but the ones I am considering are part time fun bikes (velodrome only track or a big kid BMX).
I have two steel with modern drivetrains, three vintage road bikes, and four track bikes. This is were I can easily figure out to trim the heard. Most of my previous bikes were bought/sold to trade up in quality or something that fit better.