ok, lets say I do as you suggest, If in period of one year I need 100 or so, 10k R, i would buy 5 kits. At the end of the year, I still would have a single 10K and a bunch of values I don't need at all.
My train of thought- Buy a kit of assorted passives, and then buy reels of the stuff I use the most. And about shelf life, the same as with all supplies (batteries, food ...) you buy in bulk and you rotate, that is if you make some project, then you can use up your 2-3 year old component and buy new ones.
I'm taking my first baby steps ir EE, so all advice is welcomed, but the main question I had was about difference in quality of manufacturers, because, there is a price difference.
Btw, English is my second language so thanks for grammar lessons (no sarcasm).