Ok, yet another of the many bad auto-translation programs or websites is what I'm guessing here... I've mentioned this before, that those translation utilities are REALLY BAD at handling the interpretation end of translating... Most are just one for one direct translations, disregarding meaning or intentions...
I'm guessing you are asking why developers, using the various engines, don't have a more equal ratio of things like Female to Male Protagonists, as well as an equal amount of the various fetish/theme types?
If that is what your asking, or at the least talking about... Then yes, there is a disproportional mix of all those things, but that can be attributed to several factors:
1 - This is an amateur developer driven market, with each developer having different reasons for why they are developing these projects in the first place... Some may have different target audiences... Some may have different things they like and/or dislike... Some may find it easier to write about what they know and/or have proper insight about, vs what they don't know, etc... The reasons will vary...
2 - For some developers, they want to make money quickly... And perhaps it's easier, less time consuming, and requires less creative thought, to just copy/imitate what has been done before, rather then coming up with new ideas... Many reasons and/or excuses come into play, that may lead down this sort of development road... For some it's due to lack of innate skill/ability/talent/experience/etc... For some it's due to lack of creativity which leads to lack of originality... For some it may be attributed to a misconception, that those fetishes/plot themes/game play mechanics/scene choices and so on, used by previous developers, are somehow popular amongst readers and players... When it's actually the developers themselves, that are driving the over use of certain aspects of story, game play, interaction, themes, character stereotypes, and so forth... Leading to some developers copying what others have already done, regardless of how successful or unsuccessful those other developers were... Taking the easy road to making money...
And the list goes on...
It's a complex set of reasons why there isn't a real balance of content across the spectrum of VN/Games... And I would not expect it to change anytime in the near future...
Zip