Really easy, the current developers keep doing what they do best: develop the game.
Though they do one more thing: they hire a new person. This person will spend his/her time on the suggestions forum looking for good ideas for Spiral knights and such, THEN he/she will show these to the developers. The developers will then decide whether it's a good idea, or a bad idea.
With this method, the developers will only read the "good" suggestions instead of looking trough 100 threads to find 1 good idea. It would save them a lot of time and make the community happy.
Problem solved?
They do read the suggestions but have not not commented since 6 months ago (except for that 1million ce thread). Otherwise, good idea, but that person will still have to go through all of the threads. But a normal player would be willing to do so. Im guessing you want to do it?