0 , because real money destroy all "free" games
Depends how much caps can one gather in 60 minutes. 1 hours of work in USA for a minimal pay is about 6$. Since the online world is mainly focused on american way of live, the minimal pay means that 6$ = amount of caps that can earned in 1 hours of grinding. I think its save to assume that one can gather about 3k(Amount taken totally from the air though).So if players can earn 3000 caps in hour then 3000=6$ so 100k is worth about 200$.This is pure theory, most likely even really silly one, but so does the question. Also since i`ve taken information from old polish article its probably likes miles ahead from true evaluation(source: http://www.mowimyjak.pl/praca-i-kariera/praca-i-kariera/ile-zarabiaja-amerykanie-najlepiej-i-najgorzej-patne-prace-w-usa,110_41982.html)
The fact is this game wipes so the in game money would be worth less because of that fact. No one wants to pay real money for fake money that can disappear at anytime.
People who pay real money to advance in a free game are the lowest form of retard. Just send me your money and watch the numbers go up on a calculator and you will get the same effect.
There has never been a pay to win game that wasn't shit.