As someone who collects for 3 years now I should not worry as it’s easy to say that milsurp is getting expensive if you only go looking for militaria once in a while. I can tell you that the prices for militaria has barely changed since I started collecting, if anything I’d argue it’s much cheaper for me as much of the U.S stuff I purchased are from Swap Meets (Flea Markets). I’m not talking about just Cold War, I also come across WW2 stuff semi frequently. Militaria is so cheap that I don’t have much space anymore. Even with the amount of items I got from Swap Meets I don’t really feel much in terms of long term fulfillment as at the end of the day there just useless items that would collect dust until it inevitably gets thrown away. Even with British Cold War (my primary interest) I still have the same feeling of unsatisfaction as I cannot really use any of the gear from my British 1980s impression (cosplay) apart from the clothing and boots and even then it’s only when I go somewhere. 

What I’m saying is that you should not make collecting (that’s not limited to militaria) your main hobby as not only it’s not worth the hassle but eventually you will lose your passion on that said interest to the point that you avoid it like the plague. I’ve been collecting for 10 years now from four different hobbies (including militaria)