This looks like the way to go full Digg. With payment comes verified accounts, and probably further segmentation of accounts with higher priority than normal accounts. The idea being the paid accounts are professionals with high karma, therefore assumed to provide better content and become prioritized.

This is exactly the way of thinking that destroyed Digg. Although this is tweaked compared to what Digg did, the basic idea is the same, and the outcome will very likely look somewhat similar. The quality of content will fall off a cliff, and the userbase will quickly evaporate.

Even if they never go through with this scheme, it shows the leadership of reddit has lost their perspective, and sense of the community shaping that originally made reddit good.