I would say it would be the other way around. Raw materials and things that are in high demand need to be able to sell fast and easily, while rare items, finished items, and slow selling things can sit on a retainer for a while with no issue. It's how it went in FFXI; bazaars only sold things that were too slow selling and expensive to keep relisting on the AH, and things that literally could not be put up on the AH.