Good point. We will add more features in the near future, for which users will need to get a license, but our model is very close to what Sublime Text or some others offer, where there is always a free option for evaluation or non professional use.
Since you explicitly mention Sublime Text: their pricing is listed on their website and they have a clear 'Buy' button. Not sure why you would share that your pricing is similar and name a specific product, but also appear unwilling to display what the pricing and featureset is.
I found two competitors, signed up to both with Gmail and paying for one. Not my loss, doesn’t bother me.
What is the logic behind all these stupid rules? Money is money, customer is a customer whether they have gmail or some other fancy email, right?
So please make the commercial option more visible and transparent -- without people having to email you.