I'm thinking you don't understand economics of this. You want to reduce field size and somehow that could cut registration fees? And you want to cut out the very grass roots stuff that you think running is all about?
I dunno man - It just seems to me you are constructing some kind of fantasyland that doesn't make any sense, logically or financially.
Fixed costs are huge on an event in NYC with 25,000 people (the bkln half). You need to cover the fixed costs. You get a sponsor - maybe that gets you $100k. You need a big field to cover your breakeven point.
In that sense, a 25,000 person NYCM with no elite division would probably cost $400 per person - sponsors would flee and the smaller field wouldn't cover the fixed expenses at $250 per.
I'm not privy to NYRR #s, but I doubt you are making much sense here.