Earlier this year, Amazon introduced a program that pays developers of the most popular Alexa skill games. Today they’ve announced that the rewards program is expanding to now include Alexa skills in six more categories. Developers of Alexa skills in the categories Education & Reference, Food & Drink, Health & Fitness, Lifestyle, Music & Audio, and Productivity will now also earn money if their skills receive enough engagement. Amazon has still not revealed specifics on how much can be earned, but they will use metrics such as the total minutes a skill is used, the number of new customers, the number of recurring customers, the skill’s customer ratings, and more to determine how much a developer is paid each month. One Alexa developer tells TechCrunch that he estimates the top skill in a category receives about $5,000 each month, #6 gets about $2,000, #7 gets about $1,000, and #300 gets about $100.