Two things:
One, I still don't think this really clears everything up. If Boston wasn't serious about making an offer, they wouldn't have been in talks with Meb and co. for the last 6 months. Meb is probably telling the truth (i.e. no offer was made), but not the whole truth. If it was clear to Boston/Hancock that Meb was asking for $250k and would not come for less than $150k, then there was no point in making an offer. Once the non-offer was made, Meb could then say that he didn't get one and he would have run for any reasonable offer (which was never defined--whatever Vega got offered, for instance, may not have constituted a reasonable offer in Meb's mind).
Two, any major fall marathon seems a bit risky for Meb, given his age and injury history. New York is out of the question. Chicago is barely over three months out. Berlin is the best option, but still gives less then 4 months to recover and get ready for Houston. So... why not skip the paycheck this time and do the World Champs? Good championship experience for the Games, and good timing.