If you ask your friend for $100 for no particular reason, just because you want $100, that's an annoying request and "no" is a reasonable response. It's not putting a price on your relationship. It's technically the same answer they'd give a stranger, but that doesn't mean you're being treated like a stranger.

(I do think a slight discount often makes sense just because a friend is probably quicker and easier to deal with. But anything more substantial turns into asking for free stuff, and yes and no are both perfectly fine answers to that.)