Agreed, I'd like to see a 50% mod, 75% is too much and while you *can* get by with 25% sell-rate, it's much more fun to find high value items knowing you will get back half of its costs...
One thing you might not realize is that merchants in the game rarely sell for 100% of item value. The merchant at the camp sells at 150% of item value. When I was changing the files, I noticed one merchant sold at 300% of item value. Most seemed to be in the 120% to 150% range.
If you buy an item from a merchant at 150% item value, and then you later sell that item at 75% value, then you're selling the item for half of what you paid. That doesn't seem unreasonable to me.
I considered changing all of the merchant's sell prices to 100%, but decided against it.
I also considered changing the merchant's buy prices to half of their sell prices (with 75% being the cap), but decided against it.
Of the 39 files I changed:
6 sell at 100%
8 sell at 110%
1 sells at 115%
11 sell at 120%
5 sell at 130%
1 sells at 140%
3 sell at 150%
1 sells at 160%
2 sell at 200%
1 sells at 300%
Average those out, it comes to 128.6%. If you disregard the one that sells at 300%, and the average is close to 125%.
Buying at an average of 125% of item value, and selling at 75% of item value, means that on average, you will get 60% of your money back when you sell the item.