
This guy is weird. He costs too much money to effectively generate the money and bonuses that he might seem like he is supposed to be granting. There are too many disadvantages. The highly competitive slot, the high cost, the high bonus threshhold.
But then when you add in a powerful resource generation framework for him to inhabit, some Hot Streaks, a few Burglaryes, a little Lone Wolfing, Jenny Barnes's natural ability, Dario will take off and fly you to the finish line like a magic carpet ride.
That really is the gist of it. If you can generate the kind of $$$ that Dario needs, he's really really good, but getting there takes a lot of cards and quite a bit of time, you better have some powerful resource dumps ready for the late game to make all this setup worth it.