It's actually true that well done ecchi will frequently outperform hentai because hentai often looks like crap despite the fact that visuals are really all that matter, well maybe voices... definitely not plot.
They just want to go low budget and churn it out I guess.
Though imo, this ero doesn't hold up to stuff like Kanojo x Kanojo x Kanojo :3 That's not really a fair comparison though.