Main Menu Market Board selection screen where you can buy items from...
Pros
No need to ever go to a city or location for buying items from market board.
No mass gathering of people at market board locations.
Lower Teleport Fees due to not teleporting to cities for items & back to same location aka wineport.
History price check as soon as you get a item your unsure what its worth.
Less amount of Market Boards placed in towns (Since there not needed)
Faster buying of items from market board (both pro & a con)
Cons
Probably increased tax from using this feature instead of location boards.
More mass gathering probably in other locations such as Rev Toll.
Not having option to buy items in a duty.