We went ahead and booked it, thanks for the responses! I'll post a review on here after the trip which I am looking forward to like crazy.
Total price was $1021 inc t&s per night for the spa pool villa for 3 nights alongside the $2400 total resort credit.
Their lowest advertised deal was $832 inc t&s with no credit.
The confirmation receipt said the package we got was called PROMO: Banyan Tree Mayakoba : Closer Than Ever and the credit's good for room service, restaurants, minibar and spa.
We could probably have gotten a better deal as ABG suggests, but we are happy with this, and i'll let you know how it goes!
Thanks for the concern, when I read the deal on the website I figured you must be right, but I wrote back and now I have got it in writing...the reservations officer seemed as surprised as I was! It's an enhanced version of the promo, it seems. Pasting the specific details below. Sorry to spam the forum up, just if anyone else wants to try for it it might be worth a go, the reservations officer we got is called Brigitte.
So this is straight from their email (maths method seems crazy but its still a clarification) :
805usd X 27% (12+15)=1,022.35X3 nights=3067.05usd -2415 resort credit = 652.50usd to pay for 3 nights of stay inc taxes+ service charge.
805X3nights=2415usd Resort credit
Conditions of Promo
Apply for new bookings only.
Apply from SPA Pool Villas upwards
Minimum stay of 3 nights required and it is subject to availability.
Promotion cannot be combined with other offer or promotion.
Resort Credit will be calculated based on cost of villa per night (before taxes and service charge).
Resort credit is neither transferable nor refundable, and can be only used during current stay and not for future stays.
Resort credit is neither transferable nor refundable, and can be only used during current stay and not for future stays.
When are you going? We... settled for the tides after and errrr... uhm.... <swaying drunkenly> we might drop over...</swaying> and gulp...give you a hand with the allowance