What kind of games did you buy then Decay? If you like hentai titles then that's understandable. But the vast majority of story VNs are fan translated, not done by english distributors, much less mangagamer. Its not just extrapolating from a sample of one either, just look at vndb, the most popular VNs are story heavy and not hentai titles (nukige?).
For example going by the most popular list on vndb, if I wanted to buy Fate/Stay Night, G-senjou no Maou, Saya no Uta, Ever17 or Sharin no Kun. I can't buy it from mangagamer. The next 5 on the list, can't buy from mangagamer. Same thing for the next 5, or the 5 after that. Mangagamer is irrelevant to my and going by this list many other's preference in VNs. Nothing comes in from mangagamer til #26 Kirakira.
Now Kirakira I've actually tried bc of good reviews on the net but urgg hated it. Too boring, too much cutsy idol stuff. Deleted before finish. #27 is Kara no Shoujo, I assume this is what sanahtlig means when he says MG's best title. This actually looks interesting and something I might enjoy... maybe. But I would not of known about this if sanahtlig had not mentioned it. Oh by the way this is prob the reason why sanahtlig say Kara no Shoujo had poor sales too. If its so good then Mangagamer should of been putting it on the frontpage, screaming how good it is. I've been to mangagamer's site before and I had no idea mangagamer even had non-hentai/moe titles. Instead the site is just boobs everywhere. In real life people don't go to a sleezy adult book shop to buy a complex murder mystery, and people who buy complex murder mysteries will get turned off by adult book shops you know?
Anyways back to the point, vndb has currently 16427 entries of vn's, all of mangagamer's titles combined are not even close to 1% of that, of those most of them are simple hentai titles that aren't very popular. There's tons of untranslated titles that people want that MG isn't even interested in doing. MG frankly has no business telling fansubbers what to do with their spare time. If they wanna complain about poor sales, they should really have a look at how they market non-hentai titles before blaming fansubbing. (I also see credits for TLWiki on the Kara no Shoujo page, did MG even translate this?)
What this medium needs is more fansubbers working on fun titles, not less. You can see from other stuff like anime and manga. Its pretty popular around world now mostly due to the work of many generations of dedicated fansubbers. You can even find anime and manga titles on amazon or new york times best seller lists. Meanwhile VNs is the least unpopular of the 3, due to most of it is still in inaccessible Japanese and the bad rep of been associated with pornographic content.