The current market system rewards players that put a little effort into selling their items and provides opportunities for sellers that don't have millions of gil and thousands of items to sell. Both the lazy, rich players putting up large stacks and the more dedicated players more frequently putting up smaller stacks or players who only have a few items to sell have the ability to make income on the market.

Now the lazy players want their stacks to work like big and small stacks so they can completely dominate the market. It is much easier to lower the price on a few giant stacks than it is to adjust lots of small stacks. Those willing to put in the time and effort to put up small stacks and adjust them should get the reward.

It's the exact same logic that's used throughout all game aspects. Players not willing to do dungeons can't get the gear from them, players who don't level multiple classes can't use abilities from those other skill lines - why should players who don't want to put any effort into the marketplace get maximum rewards?

The existing marketplace functionality has the additional benefit of helping to avoid undercutting wars crashing prices. Small stacks can be priced higher than large stacks(which is obviously one of the things the complainers in this thread are butthurt about) helping to make prices less volatile. If large stacks also act as small stacks then everyone will price their stacks lower and lower breaking the marketplace.

Square Enix don't coddle the lazy and greedy players - please leave the market as it is.