Hi Michelle - as you know we are having our DW at Beaches T&C in May and the government fees are covered. I have no idea why they would tell you that unless you moving the reservation somehow takes away from their commission from the reservation. But regardless, giving you false information is not cool.
Yes, Beaches T&C is more expensive than many other resorts. T&C is just expensive in general...it's a newer destination island....if I remember right, tourists just started visiting in the mid to late 80's. But from everything I've read and heard from others that have been there, it's going to be worth it Our reservation is for one week, in the Honeymoon Grande Lux King room, and I think our reservation is right about $4k (for 3 of us) if I remember right...so about $2k per person. I think if we booked it for just the 2 of us it was about $3,500. And yes, you could do a 2 week cruise for the same amount (we usually cruise once a year and always get a balcony cabin and for the 3 of us it's usually just under $2k), but it depends on the experience you want for your wedding. If you really think the cost is too high then it's not too late to cancel your reservation and book a different trip. You should never feel forced to stick with something you aren't comfortable with.
Also - it's not too late for you to switch TA's....if you do decide you want to stay at Beaches, maybe try reaching out to TA Jennifer and see what's involved with transfering your reservation. I know it can be done, but she could better explain what needs to happen.
Good luck with whatever you decide