Dragonessti

I plan to buy 50 items from the marketplace this coming Friday. That's more than usual, but it is typical that I buy more than ten items at a time, especially around the end/first of the month. So, the ten items limit is very inconvenient. I have no idea why I can't add more than ten items to my cart. Please someone explain it to me, and tell me how to expand the limit so I can buy everything at once instead of add ten to cart, buy, add ten more, buy, add ten more, buy, add ten more, buy, add ten more, and buy.