Since they add new series and events from time to time I thought it would be nice to have the best R$ and fame mining races listed for each career level, so that regardless of whether you are playing at the highest levels or just started in amateur, you will know which event is best for building up your resource stocks or adding fame.
I have been grinding the V8 Naturals/ Speedrush/Endurance in amateur.
I don't know of any others in Pro Am or Pro that are better, and that's where I am at now. I thought the 1st event in stage 7 of Scuderia was probably the best earner ever, as I ran it on my 100% daily bonus with the manager and engineer and the other guy, and I ended up with around 120,000+ R$ and somewhere between 8500 to 9500 fame for just 3 Laps and 5:46 of time!