First, let's be objective: if you look at the top trending posts, they are not all #introduceyourself. Right now about half are actually from other categories, and some posts from #introduceyourself are the posts of people discussing about verification, and not actually introducing themselves. Some posters have an almost uninterrupted flow of great posts that get a high payout. After if you start looking at 2-digit payouts, there is a looooooooooooooong trail of posts that cover many subjects.

So it's not true if you look at the complete distribution of votes that in average introduction post are receiving more love. Most of the payouts are going to actual content. The reason why introduction posts are more frequent in the 3-digit payout range is a simple matter of probabilities. Whales do not coordinate. Every active whale is going around and voting stuff she likes in all of the categories she is interested in. It just so happens that, very logically, every whale is interested in the growth ot Steemit and the acquisition of new users, and therefore including #introduceyourself and #steem in their daily curating routine. In that situation, probabilities implies that posts from these categories and other categories some whales may have in common like #travel and #photo will seem to receive more love. But in fact whales are actively voting everywhere. 2-digit payouts involve at least a couple of whales.

Now the question is: how long will this last. Well there are two answers. First, because the network is minting money at a very fast pace, whales are getting diluted at a steady pace, so their relative influence on the voting process is already in the process of reducing and by the time the platform goes out of beta, many whales will probably have sold a part of their holdings and the diluation will have reached a level where whales won't be as predominant as they are now. In a shorter term, what's going to happen is that word of mouth and network effect are going to take over economic incentives as the main growth driver, which means that the number of new users is going to go through the roof to the point of being impossible to keep track of, and it will get less and less responsive to incentives. Naturally, observing that, whales have no reason to keep wasting time scouring the #introduceyourself category, and will diversify further their routine.