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This is a really high(shocking even) number and would explain a lot. 

Yep!  DLSite takes a pretty penny for sure, but it's worth it for the extra reach to foreign markets.  If you're curious, you can take a look at their pricing model here: http://www.cf-dist.com/

So as that page says, selling the game at 1000yen nets me 450yen after DLSite/CuriousFactory take their cut.  I'd like to put it up for cheaper, but any lower and the percentage I get becomes smaller and smaller, and idk I already kinda dislike having a minority share of the profits as is.

Needless to say,  I definitely try to encourage people to purchase my stuff here lol