Satellite bill question

I have 9 months left on my 24 month contract with DirecTv. I got a bunch of rebates and things so my bill was $40. Now some of those have run out so my bill is now just on $70 a month.
So I was wondering if this made financial sense or not. DirecTV charge $70 to drop the Advanced HD receiver and get the standard one. I get charged $25 per month for the receiver.
So I wouldn’t see any immediate difference for the first 3 months, but I would be saving that $25 for the last 6.
Worthwhile? Or is my logic fuzzy again?