Yeah, don't know what to say about this. It's quite steep from the start, getting to 30 requires already about 8% of what one needs to get to 100, and to get to 60 you need almost 30% of the total experience. So I guess that progress will be very slow from the start, and getting to something like 100 MF (lvl 33) will take some time already.
Perhaps I am completely misunderstanding but where does it say it takes 10 billion to get to level 100? The total XP is 300 million.
It seems that we can expect 3600*1.25 exp from act 3/4 mobs. Then we also have the NV buff, so we are looking at roughly 8k exp per mob. For a very rough estimate, take 4 zeros off of the numbers in the table and that is the number of mobs you have to kill (with 5 stacks NV).
it's not 10 billion it's 300mil to get to 100.
Also +exp gear works or not?
I am not sure how it works. Does the table give the amount of exp required to level from 0 to x or from x-1 to x? If it is the latter, the 10 billion makes sense I guess. The first option still requires a quarter of a million (give or take a few) imps.
The table indicating the curve from 51 to 60 doesn't help either. From 59 to 60 is either 150k exp or 2.4M. In any case that is significantly less than 7.2 or 4.8M.