I've got about 50k points on Marriott at the moment - and haven't stayed at a hotel since Dec 2007 (downturn...). I know points are valid for 24 months - but... 24 months since last what? Point acquisition; or stay?

The only reference I can find on the T&Cs is "An account may be closed at Marriott's discretion if no points are accrued during a 24-month period. All points in the account will be forfeited at that time."

I spent $12.50 to purchase 1,000 points last month.

Has it reset my 24-month counter?

Andy.
PS - I understand points purchases are NOT counted for SPG expiration, but they are counted for Hilton.