It is true it is not really balanced. I look at Rinaldo (I know, I'm always refering to him, but hey, he has experience...) and he got in one adventure, when he leveled form 2nd to 3rd, 8500 worth of loot. After that, he didn't gained half of that and he is now level 5. One reason, it is because he is higher level than most other player in the adventure he goes, and we split evenly, not considering the level. (Presently, Rinaldo is in an adventure with two 1st level character and three level 3 or 4. What reward can you give to such a group?)
I see one way to repair that, it is to give reard to that specific player. That mean most of the time, he had to be alone at some part of the adventure, or maybe for all the adventure. It could also be a nice way to take avantage of the background of a character. But doing that for every character, it would be more than a full time job for a master.
I don't see any miracle way, and I am a bit against giving thinsg freely like that.
There is another option. You become a Trader and take advantage of the Haggle and Bargain power to make lot of profit
