For basic licensing, font owners earn 50% of every sale at MyFonts. You set the prices and get half of what the customer pays. There are exceptions, however, involving Monotype’s webfont subscription product and OEM sales. Read the contract carefully and their very useful Foundry Guides.
MyFonts’ 50% rate is on par with most font retailers, including the other Monotype owned properties: FontShop.com, Fonts.com, and Linotype.com. Some sites offer a better rate, such as Fontspring which pays foundries 70% of each sale.
The commission percentage is important, but it’s not the only factor involved in choosing a retailer. Each shop serves a certain segment of the market. Some have much better visibility and larger audiences than others. Some, like MyFonts, have much larger catalogs than others, so your fonts run the risk of being buried by the daily onslaught of new releases. Some provide services or products that others don’t.
Depending on your product, and the amount of work you want to put into making and selling fonts, it might make sense to sell to customers directly, rather than through a retailer. Or it might make sense to choose a foundry to help produce and publish your fonts, as well as handle all the marketing.
I outline these decisions in this article. It’s old, but most of the principles still apply.