Hi Insiders - This is a topic that has been tossed around several times in these forums. As a Platinum, I must say that I would like to to have free parking offered to me, however, as others have discussed in previous discussions, in some properties, especially in cities, the cost of parking is very high and for Marriott to offer free parking, they would have to make the cost up somewhere else - perhaps cutting back on the concierge lounge, or raising room rates. You don't get something for nothing anymore. Also, I suspect that the $400 some-odd price mentioned in the original post was for a multi-day stay and not just one night as surmised by another insider. While I sympathize and have been in that same situation, I take parking fees as a necessary evil.
NHTraveler is correct. This subject has been discussed at large here many, many times.
While I totally understand that some properties do not have their own parking facilities but act as a middleman, there are an awful lot of properties that are standalone and yet have that swing gate. Some that come to mind are Orlando World Center and Grande Lakes resort and San Francisco Airport. I can see these properties offering free parking to elites.