what would you pay...

[Haunz 10+ year member]

since when can you replace coils and not recone?

When you own this sub:

 

[Haunz 10+ year member]

I am assuming you are clipping the hell out of the sub which is what makes the voice coil get hot.

Power is power. A voice coil won't get any hotter with 1000 watts of distorted power then it will with 1000 watts of undistorted power.