I have one client that I do mates rates for, my standard rate is $55 per hour, I charge her $45, I also offer discount to some clients that I know are in a situation to send me clients, I offer them $5 off their next appointment for every client they send me.
Rates for mates is quite a good idea (some may disagree with me), but keep in mind what some people do for a living, sometime in the future they may also offer you a discount on what they do, or what they provide.
5% off nails is nothing really, compared to someone giving you 5% off a car, 5% off carpet, 5% off a haircut, 5% off your new curtains etc.
Be careful where you decide to be staunch, it may come back and bite you in the A_S_S sometime.
WHAT GOES AROUND COMES AROUND, I SCRATCH YOUR BACK, YOU SCRATCH MINE, BLAH, BLAH BLAH.
Only yesterday I spend 2 hours with a geek from here, did her nails, showed her a few tricks of the trade and hugely discounted her service ....... even though I didn't know her, she came all the way from the UK, hunted me down and I considered her a mate (I also considered her a guest in both my salon and my country).
It was also my most enjoyable appointment of the week, it was like a mutual respect and appreciation.
I run a business first and foremost, but I'm not a miserable git either.
I've been in the nail business for over 22 years and I know when a discount is worthy.