[oliwarner]

But no random consumer analytics company is going to buy Visa or Amazon and all their data for six or seven figures, or whatever this would be valued at after a couple of years.

Why is it worth anything? The users of this system are the people with enough to lose. Top-1%ers. With deep metadata stored about their purchasing habits. The direct marketing and informatics value would be immense.

I'm with the GP and many other comments here. This data is valuable, both against you (in targeted marketing and theft) but also to you. You should collect this data, store it yourself, offline, in a safe with those other documents and keepsakes you could never ever replace. It's the same process. It's probably easier on a bit of paper too.