allexx, in two words can not explain ....
Hang in the gallery at 800%not at all does not mean the desire to sell or market price on this thing.
In Europe, for example, the mass of the gallery is asking for the end of the 3 most expensive sales registered a particular artist in the market.
They ask for more than a year, although the works were bought by explicitly on record prices.
This "pricing" can be attributed to several causes and conventions.
First of all, such work is best of the best there is or has been on the market for a particular artist - a masterpiece.
Masterpieces of the market units, such work after the regular resale, for decades to withdraw from the market in private collections.
In this case, the gallery is not looking for opportunities to sell the work as quickly as possible, the work becomes part of the 'face' picture hangs in a prominent place, is a screen saver on the Internet. Many galleries do not live in the first place, from the sale of paintings. Someone provides space for the exhibition, someone with the backbone of major collectors and sells them for painting at auction, someone organized a "job" to his wife, and someone just keeps place in the center, historic district, a strategic considerations. Many nuances around the bush, do not lend themselves to any logic.
For the purposes of vysheukazanny need a set of decent work to maintain the image.
For example:
http://www.berkofinepaintings.com/Fr...BJECTID=347290
Ask the 85t euro, a masterpiece, but it is for this theme, the price of the market by this artist 20t-25t Euro.