yes, but the deal is that you stay "x" number of nights on points, then pay "Y" dollars for the additional nights you want (rack or maybe member discount) but you can't stay a night which requires say 10 points, have say 8 points and pay a cash amount for the lacking 2 points unless you buy from MS the 'one time use points' (at I think $15 bucks each - up to 24 points per year). so per night, cash and points can't be mixed unless you're buying one time use points.
HTH