Why is a Bush insider and chairman of America's seventh-largest home-building company selling large amounts of his company's stock?

...Dwight C. Schar, the chairman of NVR, ... tops the list of insider sales so far this year. In eight days in May, Mr. Schar sold $88.4 million worth of stock in NVR, based in Reston, Va.

...Mr. Schar, 63, who would not comment for this article, also owns a stake in the Washington Redskins football team and runs with Washington's political elite as the Republican National Committee finance chairman. President Bush often singles him out in speeches to thank him for his fund-raising prowess.....

That's from an article in the New York Times business section. Here's that article's lead:

Home builders have never had it so good. Low interest rates and creative financing have caused a frenetic pace of new-home construction across the country. Builders are reporting blistering earnings and their shares are trading at or near record highs.

Now they are cashing in. Executives and directors at many of the nation's largest development companies sold stock at a record pace this summer. Insiders at the 10 largest home builders by market value, including D. R. Horton, KB Home, Toll Brothers and M.D.C. Holdings, have sold nearly 11 million shares, worth $952 million, so far this year. That is a huge jump from the 6.8 million shares, worth $658 million, that insiders sold during all of last year, according to data compiled by Thomson Financial.

Market specialists often view heavy stock sales by corporate insiders as a possible indicator that share prices are headed lower. Some analysts say that the share sales by home builders are reminiscent of the heavy dumping of stock by technology company executives just before the technology bubble burst in 2000....

And there's this, from another Times story today:

A real estate slowdown that began in a handful of cities this summer has spread to almost every hot housing market in the country, including New York.

More sellers are putting their homes on the market, houses are selling less quickly and prices are no longer increasing as rapidly as they were in the spring, according to local data and interviews with brokers.

In Manhattan, the average sales price fell almost 13 percent in the third quarter from the second quarter, according to a widely followed report to be released today by Miller Samuel, an appraisal firm, and Prudential Douglas Elliman, a real estate firm. The amount of time it took to sell a home was also up 30.4 percent over the same period....

Outside Washington, in Fairfax County, Va., the number of homes on the market in August rose nearly 50 percent from August 2004. In the Boston suburb of Brookline, Mass., where many three-bedroom houses cost $1 million or more, the inventory of homes for sale has increased in just the last few weeks, said Chobee Hoy, a broker there.

For-sale listings have also swelled throughout California, according to the California Association of Realtors. In the San Francisco Bay area, they have increased 16 percent in the last year, Coldwell Banker Residential Brokerage said....