It seems that the fact that comic books and collections will NOT make you rich has developed a new Greed niche. $15,000 for a piece of Brian Bolland art that he would never have been paid half that for. It's greed. It is also why some comic artists going to conventions now charge for a sketch or illo because most of it ends upon Ebay the same evening.
You get to see comic art -as close as the vendor lets you get!- and buy lots of pages to make the vendor rich -listen to the "speak" used its the same used to milk people of money with those "investment comics". Basically, these events have people who will put what price they want on a piece of art and it's all very closed shop as an industry.
Will these pieces of art make you rich in 50-60 years time? Who knows but maybe one artist out of every 50 will be "sellable".
Bottom line: it's just a new way to fleece...this...."friendly hobby".