This is an overview of the benefits and the consequences of this feature.
1. This idea would steer Imgflip away from its core focus. Instead of providing a service for people to easily make images, Imgflip would be focused on earning points/real money from the commissions.
2. If such feature would be implemented, judging from the website's focus, it probably would not be used by most users for art commissions. However...
3. It could be used for meme commissions. Because you earn points/real money from it, it could give incentive for users to make high-quality memes. This may reduce upvote begging, reposts, and other low-quality memes.
4. Since you are requesting creations from another user, this would increase engagement within the platform, therefore leading to a more active community, boosting Imgflip's ranking.