By hurting the crafting community. Everything being made absurdly easy means they're very little for crafters to strive towards, especially since Expert Recipes are mostly pointless.
This is such a silly mentality. Undercutting you by 1 gil isn't an insult. It's trying to maintain a healthy price point whereby one of us will still make a decent profit. If I undercut you by 5,000-10,000 so yours "feelings" aren't hurt. We'll both make less in the end regardless of who manages to sell the item first. Furthermore, people take advantage of this. I profited immensely off someone taking your same attitude and intentionally crashing the market. I simply bought up all their product, waited a little while and relisted it all under one of my less used retainers.