I don't think this information from the NSAC is strange at all. It's all business and as Dixon says most of the guys are contracted (for better AND worse...) in Japan (as the post also outlines) where the real payments happen. These small fees strongly indicate that they are just small amounts to justify the fact that it is concerning professional fighters. The amount is low in order to avoid tax but the sums paid in Japan is a totally differnet story.

How often have we not read about a new fighter signing a contract for two years with let's say four promised fights per year. I bet the contract also states a minimum fight purse for those fights as well (for Japan). But let's say Martin Holm fights in Italy it would look strange if he didn't actually get a fee for that (just like when fighting in the NSAC territory).