Why Shopinvestment?

[Luxtrooper]

Whats the purpose to invest in a shop. The level gets higher, okay, so what? I thought that maybe each ingame week, when you visit that specific shop, you would get an amount of Oren.

[Dobbers]

If it works like in elona (which I assume it does), then investing in a shop increases the amount and quality of the goods sold at that shop.

[Melk]

Assuming that it works the similar to Elona, the shop level determines what they carry. Boost the magic shop enough, for example, and you'll see them stocking things that are actual worth buying like cure mutation potions and scrolls of flying instead of random low level stuff.

[Ostrava of Boletaria]

I think the easiest way to feel the impact of investing in a shop is to invest in a magic shop that sells books. If you invest a lot, you get way more books and scrolls to purchase when they restock and you may occasionally find rarer spells for sale like meteor.

[Akameka]

It takes time to see the quality increase. If it's like in Elona, Best bet is to gather enough money to buy 50 lvls at the same time ( you get a massive cost reduction in comparison to investing lvl by lvl ) The option should only appear if you have enough money.

Investment perk reduce the cost of investment. So really important if you want to increase quality of stuff sold. It's very important because you can see really good items from time to time once you put 50 or 100 level in general store or magical/potion store.

Ideally, you want to get the Investment perk and Max its potential with trainer before doing that. Although it is still a massive potential loss in comparison to investing level by level, so I wouldn't do it to every merchant, only thoses that you know you'll use often (thoses of Palmia for exemple, or your home when you get to that point), and keep thoses you won't use often to increase your negotiating skill by buying 1 lvl at at time.

[LumberingTroll]

If you don't want to get into crafting, but want access to better stuff to buy you can invest in shops to get more variety. I also think just buying from them increases their level, I saw the tinker camp has all level 3 shops in my game and I haven't invested in any of them.