I think they believe that if it isn't broke, don't fix it... Era and UN get a lot of players. NPulse on the other hand does have production going on on a dev server and it looks promising. :x Playerworlds like Graal Kingdoms on the other hand could use some improvements... and some of the people who have had hidden playerworlds for years could try to get done faster.
They've had the ability to buy the things for a long time but nobody's come out yet.
I remember Oasis, konidias was working on it for the longest time... where did it go? I was excited about it!