The premise of this thread is that:

1. The two hotels are equivalent.
2. Marriott is "losing revenue" by turning away the OP.
3. Marriott isn't treating the OP well.

Perhaps the SFM is the better hotel (I don't know) and perhaps it has a very high occupancy rate. If so, they're losing $84 per night for a heck of a long time. If I were the GM of the hotel, even super-duper platinum status wouldn't be enough to match the rate and give up $11k (84 * 7 * 19) in marginal revenue.