Are you putting in your request THRU destinationweddings?????
The above poster is correct...
You can probably go online and see prices, right there...
Try that first!
Then you will know what your comparisons are.
However, if this event is all being pre-planned with a special (probably lower) rate for guests of this wedding, yes, they will want names and info to keep a list for the wedding party (bride, her parents, whomever they are working with) This would keep riff-raff from trying to take advantage of a special rate for that group/party. The rate that they are quoting may possibly include extras that are being arranged by the wedding party, etc... ( IE: special dinner/banquet, assistance towards paying rental of the wedding venue, etc...)
And, in todays post 911 environment, for international travel, I would imagine that it is not all that unusual for some places to ask for full names that match the passport.
This can get sticky.... I have planned, and been to, events where the group-rate offered by the hotel/resort was actually MORE than the rate that we could qualify for thru other things (points, gov't rate,
AAA, etc...) We have made our own reservations thru cheaper avenues, and still had us added to the 'head-count' for the event's functions.