To me it makes sense that every Channeler would have numerous angreal if possible. It also makes sense to me that there would be many angreal identical to one another (like Elayne's ter'angreal). If you can make one you would likely make more of the same in one sitting. Since there doesn’t seem to be a limit to how many angreal you can use at one time then I would think angreal, even in a time of peace, would be wanted by the masses of Channelers.

The only reason I can think of that there is not a lot of angreal is that they must be very difficult to make. The only other reason I can think of as to why there is not more is that maybe the production of angreal was limited by the Aes Sedai themselves; however over a period as long as the AoL was it seems like there should be millions of angreal even if production was limited or they were difficult to make.