People offering stock comp in an unlisted private are the moral equivalent of Jeff foxworthy’s “oh you’ll take a cheque? Hell I’ll pay the whole damn thing off then. I didn’t know you’d take a check I thought you wanted real money.”

I mean, dbx will probably be worth something but unless he or she has been there 10+ years, it's unlikely to be life-changing.

And honestly, a company of that size giving huge option packages would make me suspicious (I'm a very suspicious person though ;) ).