This confirms what I've been saying all along: there is no bubble waiting to burst; instead, the market is hot (okay maybe a bit too hot, but not bubbling hot) because of the thousands of new collectors entering the art buying arena. Why? More transparency, made possible by the excellent market data made available to any Tom, Dick or Erik out there. These sites are both known for their vast and excellent martket data research tools and collectors are subscribing in droves, making both companies suddenly quite profitable.
Of course, the introduction of on-line brokerages certainly fed the stock market craze of the late 90's as well and we all know how that turned out, but the art market is a little different and the contraction, if it ever comes will be much less pronounced. Why? Art is still a long term hold and its not the easiest thing to sell; so the market is enjoying a massive expansion of buyers but not (at least not yet) sellers.
My prediction then, is the emergence of many more secondary market sales outlets in the near future and that is when the market is going to soften up. This may take years though. With all this buying going on, selling will be inevitable and there is a market niche to be filled there.
So how to sum this all up? I don't know and its time for bed.