Yeeah, I don't think a lack of MP would be the reason for lower revenue. I don't think any of the current Nintendo mobile games have a strong focus on MP. It may be due to the game just having less incentive to pay for extra features compared to the others. Mario Run you have to buy, FE Heroes gets the revenue from buying orbs for new banners (Youtubers and whales supply plenty for that), and Pokemon Go had the extra items you can buy to help speed up the process of alot of things.
So.. yeah, that may be a good thing I guess for players, but not good for Nintendo. Not that the game would need that anyways, haha. 
Dance my pretties!
The Official Art Thread - The Official Manga Thread - The Official Starbound Thread
