Some people like to build sandcastles in front of a massive wave 
Unfortunately I don’t think most people here are interested in using other people’s GPTs. It’s incredibly easy to create, and prompts are straightforward to “engineer”.
So any sort of third-party store will just be essentially drowned with “entrepreneurial spirits” until the official one releases, and the stars can be begin to shine.
Which IMO will be the ones that can connect all the dots of GPTs functionality and not just focus on “prompt engineering”. Same song, same dance when the plugin store was released.