A few things I have read so far in this thread that I feel I should give some input on.
First off, Blackjack, you asked why Conventions are given so much space. Well, first off, there is onbly 1 Convention that got space, and it's from a long standing arrangement between the 2 Conventions (Sakura and Kumori) for the exchange of 1 booth space each. Each Booth is given an 8'x8' area to setup with. Believe it or not, this is actually a rather small space when you consider space is taken up by displays and tables. Kumori is getting a MUCH better deal from this long standing exchange, considering they basically get a $450 space with over 3 times the traffic for the low cost of a $230 space.
As for those who are concerned about the variety of merchandise. If you look into what each of the chosen Dealer's carry, you'll find there is actually a good mix. I can say at my booth alone there's a large variety, including Plushies, Model Kits, Figures, Keychains and Wallscrolls.
To the Dealers who didn't get in, I can fully understand how you feel. Last year, someone at Kumoricon dropped the ball on my shop as well as several other Dealers I know. I have a feeling one of the reasons my shop was seleected was partially to make up for last year as well as for the variety my shop brings.
Finally, to any Dealer who did not get in, I'd like to offer this. If your going to be attending Kumoricon as an attendee, then please feel free to stop by my booth with any promotional material you may have and I will try to find some way to help you promote your business at the Con. Also, if you'd like, feel free to contact me and I'll see if we can arrange some kind of consignment deal with you so at least some of your merchandise can be sold at the Con.