They have never done that with anyone I know or myself. I bought two alternators from them, one for me and one for my girlfriend.
Hell, OP could go with just batteries instead of upgrading his alternator if the alternator isn't already going bad. There are plenty of people that run 3k+ with stock alternators. Hell, I got a buddy that had 21k on a stock alternator with two d3100s and a d5100 battery. I have actually ran 2k on my stock alternator and a deka 9a31 and was fine. But it wasn't fine when I was competing.