Definitely not the case. You get 500 points for standard Acela Express(i.e. Business), and 750 points for Acela First on specific city pairs. All my PHL-NYP trips have only given me 2x the dollars spent, plus the 25% Select bonus.
From the Terms & Conditions:
*The qualifying city pairs are: Boston - Stamford, Boston - New York, Boston - Newark, Boston - New Carrollton, Boston - Washington, Route 128 - Stamford, Route 128 - New York, Route 128 - Newark, Route 128 - Washington, Route 128 - New Carrollton, Stamford - New Carrollton, Stamford - Washington, New York - New Carrollton, New York - Washington, Newark - New Carrollton, Newark - Washington.