Paul , well, you make an effort specify . Well, I can not imagine ( not to mention the practice) of such a case , so I immediately valuable 10-20 saw ... While it was once, but it 's so rare ! Even if you see someone you all valuable zaprodast ? What you write - is unclear.

You can select a prolific author, 10-20 decent good works, but of course not all of the museum level.

You can was, but now? Doubt. Although perhaps where there is.

There is a third rabbit - exposure. This is linked to another level art business .
But this is usually done a careful selection of works in the formation of the exposure.

This is the exhibition.

Added after 24 seconds
There are, of course.

Exposure is the selection of commercial work for export , such as abroad. The primary issue of trade, but a demonstration is secondary. Prices of paintings from the exhibit dramatically increased than a single sale. Pictures for commercial exposure, always specially selected.

And what of the problem of trafficking?

1.
Correction interior galleries for effective submission of work.

2.
Organize a turnout of potential buyers.

3.
An information and psychological support presentation of pictures for each customer.

Any picture of the sale becomes commercial.

So it certainly is .
Few people will buy in the size of the interior work , such as 250 x 400.
 :)

Not only the size . Some paintings in the exhibition look weak - are rejected. If there are a number of other strong exposure , the weaker of depreciate. Should share these exposures. And managers need to do much, much more ...
And if you do not buy , you have to fire the manager or be fined. Each selected him in the exposure pattern should leave the buyer in the first month of trading. I sold myself and I know that it is possible - management techniques described in the literature. Also describes the requirements for the quality of pictures. True, this is all scattered throughout literature.