That's very nice indeed, but I'd rather have the value of my stash rely on correctly aligned incentives than on the goodwill of a few hobbyist derps.
If you have a 'stash' then you can protect it by aligning your own incentives. If you run an unpruned full node then the network can not be compromised and full nodes can still boostrap in a trustless manner. If your 'stash' is sufficient value then you have a very strong incentive to pay the minimal cost of keeping your node unpruned.