I am another person who would absolutely buy enpass if it was open sourced. Since it is not, I have very little way to be confident in the security of the platform and am not willing to entrust my data to it.
I hate to be a classic "I won't buy this and neither will my 500 friends", but I was really excited to hear about your product, and really disappointed to find out that it is closed source. I appreciate you have "business interests", but those business interests prevent me from purchasing a subscription for myself and my partner. It's a paltry two sales, but maybe those might add up?
As an aside, my (limited) experience shows that when companies say they can't open source software because of "business interests", that is because those business interests are at the expense of your users.