I'm not really sold on Marcus.
At first he seems like a great addition to any big money or big spender deck, since getting extra resource every upkeep is really powerful. With Stylish Coat on your back you would get yet another extra resource at the same time, what's not to like?
The problem is, he's most likely going to snuff it before he has even had time to pay for his cost. Unless you purposefully build your deck to protect your wealthy patron, he's only a two failed treachery card skill rolls away from a trip to the loony bin. The updated version can take a little bit more abuse, but that costs experience.
So in short he seems like a bit of a trap card. He fools you into bying him dinner, but bugs out before the check arrives. That said, I'm probably still going to try to run him on a purpose-built Jenny deck to try and see if I can keep him sane long enough to enjoy that sweet, sweet 4 (or 5 with Lone Wolf) recourses per upkeep. At least Jenny has a not-completely-terrible head of 3 on her shoulders so with a little bit of help from greasy palms she could manage to keep her benefactor from loosing his mind right away.