I feel like it’s only in the game to prevent bots from spamming the trading post, that’s a valid reason to keep it however I believe this needs to be expanded as it turns a task that in other games normally takes a few minutes into a task that takes twice as long (10+ minutes) while trying to sell multiple items after a day of playing.
My suggestion is to implement a sell queue, a player would add items to this queue that would be automatically listed to the trading post at a rate decided by you (ArenaNet). Fights bots, legitimate players wouldn’t keep getting hit by what I assume is anti-bot code and everyone is happy.
Thanks!
.WildFire