What I am basically saying is that if you know you won't hit past 75 nights there is really no much sense to stay past 75 minus previous year rollover nights at Marriott (short of life time status count).

I.e. if you say had 50 rollover nights and you know you will not stay 75 nights there is no difference in status for next year after 25 nights as you already reach qualification for Platinum for net year and until you have 75 nights (stay + CC) nothing will roll over.