Board Thread:Game Discussion/@comment-28168845-20171023120821/@comment-31409792-20171023134505

Once you get above lvl 100 the fame/gold levels off at around 6000 fame/gold. And that is regardless of your current level. That means that as your level gets progressively higher it requires more and more fame to reach the next level, but you also get larger and larger rewards. There is a small degree of fluctuation from the fact that the rewards go up in stages while the fame requirement increases smoothly, but overall you average out around 6000. That means there is no practical limit to farming and you don't have to worry about diminishing returns on your 10-lappers. No matter what your level you can count on about 8.5 gold every time you run a 10-lapper (if you use the agent, and you should be using the agent).

The chart below uses the data from the http://rr3.wikia.com/wiki/Fame_Chart.