The safest assumption is likely no. The GPT store is designed to allow people to share cool specialized uses for OpenAI’s models, and to encourage people to sign up for ChatGPT Plus.
It’s important to remember that ChatGPT is a very weird product, they make less money the more you use it. The platform was never really designed to be a “new App Store” and I think OpenAI may have made a mistake calling it the GPT Store.
The best of the best might make some money, but for the most part its safe to assume being a GPT developer won’t pay as well as a full time job.