Cool idea but your pricing structure seems high. You should consider a one-time lifetime fee, it aligns with your business model.
It avoids folks signing up, canceling the card and then riding for free.
Second, I don't know what payment you're using, but seriously consider paypal if you're not already, because I'm pretty sure you can setup yearly recurring "subscriptions" on paypal and people are much more likely to keep their paypal funding sources up to date. So you're not going to have to nag them to update credit card info every couple years and they're less likely to have occasion to think "do I really want to pay for this", it'll just be pay automatically.
I'm using Stripe at the moment.
On the other hand, this is what I use BitWarden for, so my wife has access to important accounts and vice-versa. BitWarden does provide free shared passwords for 2 users.
If you're finding that the users you're sharing your passbox with are requesting your passwords every day, that's probably signal enough to remove them so they automatically use the service less. I'd expect the lifetime marginal cost of an additional user here to be a very small percentage of the revenue for that client.
This is an interesting scenario I've thought about. Thanks for sharing!
It could be the case that once the "death trigger" happens there's a countdown for the requesting user to download the data and then I (Passbox) locks everything down or deletes the original data or something. To be determined...
In your case with Bitwarden you're sharing access to your credentials and such with your wife right now, today, right?
With Passbox I'm looking to defer that access for data that makes sense. In my case I'm currently single and no one else has access to my iPhone but if I passed then maybe my mom or best friend should have that - as a hypothetical.
I just set my wife's email as the recovery address for my Gmail, figuring she can reset most of the important stuff from there.
But that's only a solution for "get into my accounts when I'm dead", not "share access to these things right now", and doesn't have the added benefit of a relatively secure password manager. And it ties you to Google, which may not be the wisest decision (but of course you could do something similar with a different service).
An initial thought I had was to look at it as being akin to an insurance policy of sorts and that's what sort of led me down the recurring revenue path. Definitely will consider one-time fees for the future! Thanks again!
I'd say your service is the internet version of someone creating their will, and leaving it with a friend or family member, which are all one-off costs.