Ok, this is saying that the vendor could no longer afford to "give out" free valet parking because of the increase in membership. That makes sense.
The original story I heard (back when it was first discontinued) was that valet parking was "in house" when it was free, but was then contracted out to a 3rd party which didn't offer it for free. It sounds like it was always contracted out.
ETA:
Here's the quote that I saw which led me to believe it was coming out of member dues.
"In order to better manage members dues, we are sad to announce that member free valet parking wil be coming to an end on Jan 1. Increasing costs to pay for the valet services at the resorts has had your managers scrambling to find a way to keep this service, but, unfortunately, it could not be done. We appreciate our members and will continue to try to restore this perk in the future if possible. Until then, please contact us at dvcmember.com if you have any question. "