Supply and demand.
paying fans want the game at a higher quality, thus leading to the tech update which will increase the games resolution.
this also means that once the tech update (finally) hits, we will... maybe... see a (hopefully) decrease in times between updates.
and there's also the fact that a "technical update" allows them to drag out the games development for a bit longer, which loops around to the whole milking arguement, but we have been getting updates throughout this tech update phase...
so... enjoy the game, it's got a load on content as is, and will probably continue getting content for quite a few years yet.