Basically if you get a lot of private plurks, most are group sent to you and 50+ other plurkers. Not replying isn’t required or expected from everyone. However if someone sends one EXCLUSIVELY to you; they probably expect / hoping for a direct reply.
The current problem is that these plurks sent just to you are being lost in the noise of all the others. Checking every private plurk is as logical as checking every single plurk on your timeline. This issue becomes increasingly problematic the more friends you have.
Proposed solution? Make private plurks that are just sent to one person a different color and/or make them always stay at the front of timeline before group ones until they are checked. This will give them the priority they deserve over the mass recipient ones.
I’ve started a plurk discussing the issue here.
Stay tuned for more things plurk,