I usually buy a bunch at a time. Not by choice though, just because its easier for me and i dont have all that much money to be spending per-month without saving up enough to afford any. I dont have horribly large amounts though so none of them are 'in the back shelf' where i cant see them. They are all on my big computer desk (on the upper shelves above the monitor and to the sides of it) and all pretty much in the very front. I have a few of the 1/6's and other big ones behind some of the really tiny ones, but thats about it. Other then that this desk is big enough, so i have lots of space for now. After that, i have two shelves emptied up already.
Besides, im moving to a dorm in about 2 weeks, and i have a good sized desk there as well, and im not taking much from home, so ill have plenty of space there as well.
Price wise, ive only gotten myself to spend $80 as the most expensive on a single one.
Im no pro-collector guy though, i wont be buying any big glass nice case for them, or even protecting them from bad effects natural or otherwise. If they get dusty, i wipe them off, its that simple. But thats just cuz i never understood the whole idea of collecting i guess. To me, if i buy something, its getting opened, and probably within 30 minutes of purchasing, and ill take care of them, but wont go out of my way to buy a more expensive case rather then just getting a book-case or something.
Oh and hi, this is my first post O: