But isn't it quite similar to the discussion about creating an app for freebitco.in ? That will cost money, but will also increase activity and exposure.
Not really. The app would be to get exposure to new users, people who wouldn't otherwise have found or come to the site.
It is not a thing you "must" have, its a thing that "would be good to have" thing and that is why I do not see any priority in that, I would assume that the current system works wonders anyway, and disturbing something that works perfectly as it is doesn't really sound like a solid idea if you ask me.
. You got some referals, some leave after just one or two days while some of those referalls might hang around for weeks. You are probably not going to break even from the referalls that you got from mellow though but I dont mind spending $10 for 10-20 days to get some referalls 
. But isn't it quite similar to the discussion about creating an app for freebitco.in ? That will cost money, but will also increase activity and exposure.
