[ojbyrne]

It says they're on a tourist visa (B2) - a B1 really wouldn't gain anything - they'd still have to leave every 3 months, and be questioned more closely each time they come back.

[nearestneighbor]

Technically, they may be inadmissible in the future now that they "did business" (talking to investors, etc.) on a tourist visa.

[ojbyrne]

You'd run into the same issue if you actually did work on a business visa. I.e. something other than meetings, talking to investors, etc.