I don't know if they were predicting a HN size load in this stage of their development. When I interviewed Kaspar for this article he said that they're looking for funding this fall to help scale, which looks like a good idea. I found the service interesting though, well worth a bookmark!
We ARE working on the payment module right now to give paying customers priority. For now, we just try keep our servers up to handle the load :)
Kaspar from Browserbite
Agreed, I would pay for priority queue in a heartbeat!