Hi,
I have to agree that if someone wants to stock up on inductors then they should have a specific application in mind. For example, if you intend to work with lots of RF then smaller inductors might do it, but if you intend to work with power supplies then larger inductors would be needed that can handle more power. It's very hard to pick them like this though because one power supply might have to put out 50ma while another power supply might have to put out 5 amps while another 20 amps, etc., and each case might use the same value inductor (like 50uH) but the current rating would have to increase for each mentioned power supply. This would mean we'd need a lot of inductors on hand, and it's not too practical to wind your own power inductors except as a side project where you just like to do that kind of thing, and even then you'd have to stock a fair amount of different size magnetic cores.
It usually works out that when you start to work on a project you come up with a certain value inductance (say in uH) and a certain current rating (in amps) and you go searching for something that comes close to what you need and you buy one or two or several as needed right there and then. Later, if you find you are working on another project, you do the same and buy different inductors. Some of them can be a little expensive too so it would cost quite a bit to stock them unless you were a company in the business of making power supplies or something like that and then you might only have a handful anyway that you would use to R&D with, then later buy a larger quantity once everything was up and running and fully tested.