Because I want the points too. If I book through the conference website and pay with my Marriott credit card it won't give me the 5x points on Marriott purchases!
Really? I'm sitting in the CL of the Baltimore Marriott Waterfront as I type this on a reservation that was booked through a conference. I have received every benefit typically afforded to a Gold Elite member including an upgraded corner room overlooking the harbor. Upon checkin, the FDC even welcomed me as an elite member and noted that my MR# was on file. I also paid with my MR Visa and have no reason to believe that my points won't be awarded as usual. But perhaps I'm wrong of this one component? **shrug**