I did the same thing as Tom (I added 120 SSR points and received the 100 developer points). The value of roughly $69 is only true though if you rent the points. If you use them, it still cost you $87 per point ($95 - $8 incentive).
My calculations:
Initial Price: $95 X 120 = $11,400
Incentive: $8 x 120 = $960
Purchase Price: $87 X 120 = $10,440
Rent Add-on Points: $10 x 120 = $1,200
Rent Developer Points: $10 x 100 = $1,000
Final Cost: $11,400 - $960 - $1200 - $1000 = $8,240
Price / Point: $8240 / 120 = $68.67
One nice advantage for this is for the calendar year 2005, there is no maintenance dues. Note Disney changed the price to $98 after June 19.