Wirelessly posted (BlackBerry8530/5.0.0.601 Profile/MIDP-2.1 Configuration/CLDC-1.1 VendorID/417)

The ratio for the U.S. Membership Rewards program is 3 MR points = 1 SPG point without special promotions. The ratio might be different for MR accounts based in other countries; I don't know. Perhaps the OP can double-check the conversion ratio for his MR program.