Well, I have a good track record of PbP. Sure, I've GM'd one or two shadowruns that petered out, but I've finished 11 Urban Brawl adventures, and 1 very in-depth adventure called Road to Redmond and we got a decent way through Road to Redmond II in my almost 5 years on this board. I'm having a blast GM'ing The Jungle so I would say saving up Karma isn't a losing option.
In terms of loot, you guys already came in with the expectation that this would be pretty bare-bones so I'm trying not to let nuyen-creep get away from me

So be creative, maybe think about what can be purchased for the team instead of an even split.....but that might be hard given the personalities of the characters. At the same time, shadowrunners, aside from gear, edge and mojo, usually count their team as their biggest asset of all because it's what gets the job done best.