Guild Wars 2

so occasionally i will decide to buy out someone’s supply of an item on the tp. we’ll use my latest as an example. jug of hard apple cider. the tp says there are a mere 11 of them available for 4s99c. so i buy those 11. well, there are still 11 available for 4s99c. i keep buying, and there were a total of 151 available at 4s99c. and this is a common occurrence across the entire tp. why can’t the tp advertise the correct volume of stock it has available?

It could be a bot that wants to keep the price low. I know those are pretty common for happenings like this.