ya, only the '72 model year of the gt550 and 750 came with a drum, so its pretty damn rare. But ya, their prices are super inflated and do not really represent what they are worth. I'm not sure I would have paid much more for this one. You can get a brand new grimeca for somewhere around $700, so an unbuilt, old, crusty gt7/550 drum is not worth anywhere near what they are selling for. But this is what happens with old school stuff that somehow becomes legendary. As the scene gets bigger, you start to get more people for which price is not a concern, they just want to have that object which has become legendary in the given scene. They get into bidding wars, and suddenly things are selling for way more than they are worth.
Which leads me to a tough decision. I got the drum for relatively cheap, and it is highly unlikely that I will find one again at a price I am willing to pay, yet I could just turn around and sell it for an exorbitant amount of money and dump that right back into my bike. On the other hand, I can keep it on a shelf for now, and restore and fit it to one of my projects when I have the money. It will likely be the latter, but the first option sure will be tempting every time money is tight and I want to buy other parts for my bikes...
Anyways, does anyone know anything about these drums? It might be hard to see in the crappy cellphone pic, but the vents have these sort of ribbed covers on them. But they don't have any perforations, so the ram air cooling can't work. Are these just an accessory for the street so that you don't get crap in your drums during light brake usage around town? From the inside you can see that there are indeed perforated screens underneath these weird little covers..