So Genetos is actually the one to point this out.
Genetos says the Global Experience Modifier is to be increased by 0.1% * fame.
The actual calculation now is 1 + (1f / 1000 * fame) = gem
The proper calculation would be 1f/10*fame = gem, according to Genetos.
I'd like to propose a fix! Make the calculation 1f/100*fame = gem, change Genetos to say "increased by 0.01%" :)