now, whether it's valuable enough to justify the price – depends a lot on how you use your email. we've got users managing 3-5 accounts with hundreds of thousands of emails each and they use our labeling/organization more than removal. think of it as of a way to act upon a group of emails no matter what the size of the group is.
(and I kinda think our website is not really good at communicating this – our traffic is mostly coming from android app right now and we've been putting website work off. who knew!).
You offer plain and simply ask for 8€ per month per account.
That's simply a ridiculous amount of money for 99% of the people, what you have but we can't see is part of the problem, not the trust, the price is just not worth for what you offer, so, don't complain about "not a single new customer from 50 clicks".