I don't think he's ever claimed to be the best MW in the world.
Also, it's not like his paycut is guaranteed to be all that brief. I mean Shane Carwin was in his second contract and was headlining a PPV for a World Heavyweight title fight and was making like 70K.
Khalidov probably makes around that or more in KSW, especially with sponsors...not to mention the EURO is worth quite a bit more than the dollar right now.
I highly doubt 70k was all Shane received though. I think he'd have seen atleast 500k after PPV buys.