I do agree with Gatso. While grinding is surely a fundamental and enjoyable component of the game, something can be done to mitigate the effort, which at times requires weeks and we do all have a life (hopefully).
Then, a solution could be found in the midst of yours positions. An idea could be to remove the xp limit but to decrease exponentially the xp gain from 75 onwards.
I consider the 50-75 threshold the most boring and pointless, a minor fix in this phase will give both the market and the game a huge boost.
Xoxo