For those who watch auctions for sport, guarantees tend to take the fun out of things. But they aren't going away anytime soon.

It's the latest development for the burgeoning market.

The painting, currently on view in a private exhibition at Gagosian, is the only one like it not held by a museum.

The "overall slowdown" in the market is particularly challenging for everyone but the megas and blue-chip galleries.

Market veterans described the sale as "flat" and not a "home run."

There's more than a few works priced about $10 million.

The question remains: What data did the hackers actually obtain?

"For every example of a weak market, there's an example to prove the opposite."

There have been a few highlights so far.

Takako Yamaguchi recently made headlines after a painting sold for $1.1 million at Sotheby's in London.