Why different prices for examination?

[qwerty]

Gala, a good adviser - is, of course, a good gallerist, because, first, as I wrote, there are no experts, equally well versed in all the artists and gallery owner, knows all the experts and therefore knows what the experts to show a specific job. Moreover, secondly, a gallery owner, in contrast to experts, in keeping abreast of current market prices for any artist, and he will not allow you to buy your favorite to work with a large overpayment.
On the second question to answer simply complicated. Nevertheless, I will say that in most cases, the work of a great artist attributirovat possible for two or three weeks, in complex cases a month and a half. Great artist is different from the "secondary" just because he has a kind, different, style of writing.