Several vendors charge for compressors & HX's. Our biggest Goodman supplier is the only one who charges something, $10-20, for any warranty on a product they didn't sell. Hey, we now have 4 outlets selling Goodman in our market and a 2 or 3 that sold in the past and beat it. Plus we have units coming in from out of the market not counting the oodles of Goodman on the net. I don't blame them.
On a dealer level, I'll warranty anything. Customer pays labor and a little something for my time writing up the claim. Can't afford to turn away biz in this competitive market.