Hey... Anita right?... We were in touch already on Facebook. The only information I have about the Paradisus vendor fee is exactly what you mentioned - $1000USD or 3 nights at the hotel.
Day passes would be used for anyone who wants to use the resort facilities for the day. All inclusive food & drinks, pools, etc. In your case, if you have guests staying at another hotel, they would just need a day pass to come to your wedding. Sometimes locals (like me :-) will spend a day (using a day pass) at a resort just for something to do.
My only suggestion would be to subscribe to some of the travel sites, like Bookit.com and watch for a sale to come up. You never know. Maybe the rooms will be offered at a super good price one of these days! It does happen :-). I got an awesome deal on Bookit.com for the Now Sapphire before. Like $130 bucks per person per night!! Almost a third of the regular price.
Good luck! I will let you know if I hear anything different.