Ok, those are nifty little toys, and not the only ones out there. However, even if you have a frame you already love, that happens to have vertical dropouts, it becomes cost ridiculous in most cases. In other words, it makes more sense to buy a fixed gear if you want a fixed gear. I've spent close to $1200 over the last 2 years to end up with something that I could have purchased for less than $800. Live and learn.