If you allow the Sideshow to also encompass placement in the regular search, then you will end up with the uber-portfolios hogging the first pages of most searches. This would be the anti-thesis of one of LuckyOliver's main themes - to help the amateur photographer break into the microstock business.
I think that allowing Sideshow images to hog the first few pages of the sort order would be a death-knell to most of the other artists. In turn, many artists would probably just delete their portfolios (since they wouldn't have a chance of selling much).