Skin bundle vs 1 skin

Tldr: I wish when we bought one skin out of a bundle that the purchase (during the duration of the bundle sale) went towards the whole bundle.

For example (my current frustration), I thought I only wanted the knife out of the mystbloom bundle. ik it came free with bundle but the knife alone is only half the price of the bundle and I didn't want to spend 100$usd at the time. After seeing it in action, I want the phantom and sherif skin now, and the accessories wouldn't hurt. BUT! the the ~4000vp (I don't remember the exact price) of the knife doesn't go towards purchasing the whole bundle. You see my delima? If I buy the bundle now I'll have spent 150$ for a bundle that costs 100$! (I know I'm oversimplifying the $ but y'all all know how it is if you don't have leftover vp you have to spend more to get enough to buy what u want).

I know riot sees it as more $ because some people will buy it regardless of the mistake of spending extra. But I wonder how many people like me would end up buying the whole bundle if they could buy the skins they're interested and decide "what the heck, I'll just pay the rest and get the whole bundle." Because of the way the shop works now I'm just not going to spend more $ on this bundle.