The real problem isn't even the playing crafters. It's the rampant crafter/market board relisting bots. That's one thing that SquareEnix has let run totally wild, at least on my datacenter. I'll give you an example.
I play on the Excalibur Server on NA. I've also got max level in all my crafting, all gear max pentamelded. I'll occasionally pump out a few of the Exarchic crafted gear to build up some cash reserves for wanting to buy a medium house in Ishgard eventually. I still have tons of difficulty making any sales on that stuff because of these chucklefucks.
Character profile for Naruko Uzumaki.
na.finalfantasyxiv.com
Character profile for Her Judge.
na.finalfantasyxiv.com
Character profile for Jessa Rhodes.
na.finalfantasyxiv.com
The three people above exist only to nonstop craft gear in their private locked houses, or in Inns in various cities. They have alt characters they pass the gear to in order to sell the gear on the Market Board. And they employ botting programs to constantly rotate through their retainers and relist their gear 1 gil lower than the current lower price. There's nothing to stop them either as there's no fee for listing products, like WoW's Auction House.
This is just one of the multiple botters that corner niche markets on the Market Board. I know for a fact one exists for housing/furnishings as well. If you want to make money, it's typically faster to just sell intermediate materials on the MB than selling finished products. And it's not even contained to my server either. I've since seen bots such as this from other servers on the data center take their goods to other servers using the world travel feature, and see bots sell their goods on foreign servers.
And the worst thing, is that Squeenix seems to only suspend these guys for maybe 2-4 weeks at a time. I've logged multiple tickets against them, but they never seem to ban the obvious botters.