Another point to make is that these packages come with certs for 7 free Marriott nights that EXPIRE within one year, so most people probably won't spend the whole wad of Marriott points at once anyway (unless they are retired or have the option of taking a 70 day sabbatical!). So I think Marriott will be glad to get the revenue generated by major LP point transfers.

On the other hand, I wonder if Marriott would really even notice the revenue that would be generated by the LP millionaires making transfers, given the relative sizes of the two programs.

Heck, LP didn't even cut off eligibilty for the million miles based on active Flyertalk threads. It took attention from major media outlets like the WSJ and Good Morning America to force a program change.

I also doubt that LP made the deal with Marriott without realizing that the millionaires would be heavy users.