It's a crap shoot. Given the poor road conditions here in New Orleans I got the three year deal for right around $1,000. 16 months in and it has already replaced ope PS2 tire which would have cost me north of $500 (installed) at the dealer. Would have been less at a third party shop but we are lacking in any really good tire/wheel shops here in NO. One more tire and I will have "paid" for the insurance...
$1,750 for five year sounds OK. Everything is negotiable, give it a shot. Might knock a few bucks off the price. But ultimately you need to think about the road conditions in your area. If the roads are in relatively good shape I would pass and take my chances.