It is all preference, like so many things with the whole wedding planning! I wouldn't be too concerned about the premium or as you referred to it as preferred vip, if people want premium alcohol and room service they can upgrade themselves...most of our guests stayed at the Barcelo Colonial and that meant no premium for them and no room service but no one cared anyway, they could still access food and TONS of liquor options (great choices too, not only crappy brands) whenever they wanted and were fine with that. I think us (Bride and Groom) and two other people were the only ones who ever accessed room service and that was only because we could and it was fun, the room service list you can order off of isn't extensive either, late night I would order plain spaghetti with butter and parmesan because I was a vegetarian and it was my only available option.
Here is a link that explains what club premium is http://www.barcelo.c...ub-premium.aspx
Our wedding was in November as well. I had to provide our confirmation number that our trip was booked (at least the bride and grooms trip has to be confirmed) and then once that was done they slowly planned everything with me. I just looked back in my email and I forwarded on my confirmed travel info to them and the initial email that started my planning was Feb 28th. It wasn't a fast process but everything WILL get planned and as far as my wedding was concerned, everything turned out more than we imagined it would!
I am happy to share and help with whatever I can, so if you have any questions just ask!