Two days of hard work did not leave a lot of time for the game... Still I'm sitting at 46M right now, pretty sure I'll get Necro, absolutely sure I won't get to the last one, but that's OK, I still have Fly Trap and Overclocked to work on.
I agree with Whispy that the numbers seem a bit too high, but I would say that having last three rewards at 35M, 75M and 150M would be optimal for me. Still high enough to require a lot of time and efforts, but low enough to stay reachable and therefore keep me playing. with current numbers, after I get 100M prize, I will just play this PF for fun, not even seriously trying to get to the last one. I am also sure that 100M would put me into top 10%, but I am definitely not a competitor for top 100. So I'll just switch to Ele and Medici.