@Ganymede
Re: Spheres--
I actually don't want to run a single + mortal(+) game, be it mage or anything else. My experience with single-sphere games is that they don't pick up traction. Now, maybe this would be different with mage, but I don't think so. You invariably get a handful of players who are at the start dedicated and are around-- and then drop off the face of the planet and the game languishes and dies. (This is what happened the first time I did DW: The Magening.)
Also, selfishly, I like a variety in what I can story tell. Mage is really great for a lot (abyssal non-sense, spirt-stuff, astral realms, and just plan magic). But I do like my hedge adventures, and I do like crazy vampire beast monsters (I love The Unholy).
This is just me personally, and if anyone else gets brilliant ideas for a mage + mortal(+) game from this discussion (PLEASE MAKE THE GAME, I would play).
@Arkandel @Glitch @Coin
RE - XP: The more I think about it the more I really like the idea of a certain amount of XP each week going to the 'player'. (Like the way ST'd scene beats go to a player, and you can +Xp/transfer them on Eldritch). ST'ing a scene would also go to player XP. Then you can have character specific XP that is earned through activity on the grid in the following ways:
- Participating in Events (1 or 2 beats, unsure)
- Aspirations (completing a short term, making progress toward a long term)
- Conditions (resolving or when a specific thing is met)
- Taking dramatic failures
- Any other way laid out in the GMCRC
@Ganymede, again! 
RE: Social System / Influence. Ugh. I'm sure it works really well on RfK, but that doesn't sound like something I'd really enjoy. Either as a player or a staffer, but then I only enjoy "politics" with a small group. I don't enjoy running political games. : /
But re: Status, the merit.
I have a pretty crazy idea of doing like a country-wide consilium / praxis thing. Where the most status a PC can get to is status 3 (because 4 and 5 means you're working at the national level rather than the local). They'd be like a huge council or primogen/priscus council going on, and stuff -- I haven't slept so I've not got many more thoughts worked out from there. There would be 'local' mini-domains throughout the country, but everyone ultimately had to obey the laws of the Big Wigs Outside The Area. The setting could be somewhere close to like the Mage/Vampire-Capital that they could brush up against the national level problems, but far enough away that they aren't in the thick of it.
This idea wouldn't work very well for werewolf. But I think it's kinda eat for mage/vampire. Also frees up the issue of approving new pcs like "are you a member of the consilium? Are you new? I NEED YOU TO PRESENT YOUR PAPERS!" 'cause everyone would be a member of the consilium/praxis already.
@tragedyjones I am! 
ETA: I'm up ~24hrs at this point, so like. Whatever typoes and incoherency is in this post is staying.