The marketplace fee is a percentage of revenue that is taken out of all items that are sold for Robux on Roblox. This fee helps support the Roblox economy by keeping the supply of Robux consistent, reducing inflation.
The marketplace fee has always been a percentage taken out of the revenue received from any sale. It was implemented when users first began to create and sell their own Clothing and was established at an amount of 10%. Later, when the Limited items system was implemented, the fee for Clothing remained at 10%, while the fee for Limited items was established as 25%.
On July 25, 2012, Roblox increased the marketplace fee for all items to a 30% fee. They did this in an attempt to regulate the Robux that came into the economy. When Game Pass/Developer Product selling became available to non-BC members, the Marketplace Fee was 90%.
This fee also applied to sales in Tickets, prior to their removal in 2016.
When you sell an item, many times you may want to know exactly how much profit you are going to make. The Marketplace Fee seems to get in the way of this; unless you use a little bit of basic algebra to figure out the amount you have to sell the item for to make a certain profit.
The formula for how much profit you make from a sale is described below, where p is the profit and x is the amount you are selling it for:
p = 0.7x
Now, let's say you want to make a profit of 100 Robux. What is the minimum amount you have to sell the item for? To find this out, plug 100 in for p and use algebra to figure out the value of x.
100 = 0.7x --Plug in 100 for p 142.857142857 = x --Divide both sides by 0.7 x = 143 --Round to nearest whole number
This means that if you want to make a profit of 100 Robux, you have to sell the shirt for 143 Robux.
The marketplace fee for those without a Builders Club membership is seen as heavily excessive by some users in comparison to what those who do have a Builders Club membership pay (90% tax for non-BC users as opposed to 30% for BC users).