I don't think those prices are high considering the amount of time the guests are staying and what they are getting for their money. They won't have to pay for food or drinks if you do an AI.
I hope I can stay in the $1200 and under range, which might be possible since our wedding is going to be in Montego Bay, Jamaica in July. Montego Bay is much cheaper than Negril. And I've found out that it's all in where you are going.
Jamaica is pretty reasonable with prices, but some places get really expensive.