Hopefully the upgrade of tiers can happen throughout a lifetime use of the product, because I'm not sure if I'm going to get to 250k yearly revenue anytime soon, but hopefully in the future!

The UX of your product looks awesome and I really like the way you have set everything up including the available means of accepting payment. Plus the ability to quickly change store name and user name and not be bounded by anything. I'm getting rid of Gumroad and will use your service from now on.