Market feels more like borrowing gear instead of buying it

I didnt play much poe 1 and I only´ve played 50 hours of poe 2 but for my point of view there is a big issue on market at least at early/mid game and I can imagine this might be an issue at end game too

As I said market feels more like borrowing stuff rather than buying it, as soon as you get 1 Ex you can get a super strong weapon and then you just resell it once you leveled up a bit and get a new weapon, there is no penalty you can spend 10-20 Ex to get super strong gear and weapon at mid game and once you get 10 levels you can sell it again and get stronger gear and sell it for the same price or sometimes even get a little profit from selling it

This also causes another issue: most drops you get during your camping are irrelevant even if you get very lucky and you find an item with very good 4 modifiers it will be trash, you can get a better one with 6 modifiers at market for 1 Ex, there is no reason to invest on the item you just found

I feel this is very unhealty for the game economy and for the new player experiences, the first few days after release it might be fine but after that there is like 1000 low/mid level top tier gear/weapons at the market and new players just keep borrowing them to level up

Well there is a lot of ways they could fix Im not sure which would be the best one but I just feel like beaing able to borrow stuff from the market causes a lot of troubles for the game

1. You don't have to trade. I don't buy anything until I finish the campaign because it's more fun for me (I will sell if something good drops but not buy anything for myself). You can argue that you're hurting yourself playing that way but if it's stressing you out/making the game less fun trying to "keep up with the Jones's", just don't. PoE isn't competitive unless you're a streamer and if you're a streamer you don't care about flipping because you would be flipping/price setting (or playing SSF).

2. Flipping will always exist unless they start to bind items to accounts after certain criteria. I definitely don't like that idea, it's one of the most frustrating things trying to play with friends and you have something that would be useful for them but, nope, account bound! (Looking at you, Diablo 4 at launch)

3. You don't have to flip items if you don't want. I don't bother unless it's something "crazy". If I bought something for 5 divine but find something better as a drop, yea I'll probably sell the item I bought. 1 exalt (PoE2) or <25 chaos (PoE1), I can't be bothered.