Turns out things are usually better, easier, and cheaper, overall, if you can trust your peers. You only need stuff like Bitcoin if you have to operate entirely in a very low-trust environment, and for some reason don't have access to better ways to raise the trust level.

If you're working with lots of money and can't rope in one or more trusted peers (a bank, say) to smooth things out, with that trust backed up by a robust & proven legal framework... uh, that sure narrows down the general type of activity you're likely engaged in.