I wasn't fully envisioning credits only being transacted once before cashout either. I was thinking more along the lines of being able to create something that goes viral, a lot of people use it and you rack up a bunch of credits, and then you can sit on those credits and spend them as you use the internet without ever having to connect to a bank yourself. So people who are contributing more than they are consuming would rack up credits. they could use those credits to enrich their contributions, maybe pay for cloud services, etc.
the credits could form its own mini web economy if it got popular enough. As cool as this would all be if done honestly, I know that if i saw a company telling me to buy web credits to use anywhere on the internet and the websites get to decide how much to charge and they charge it automatically when i visit the website, and if the company i buy the credits from goes out of business then i may not be able to cash out or get my money back, then I likely wouldnt be buying those credits... so idk