How much should I tip a hairdresser or do I have to?

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I got extensions it costed $2,200 they asked if I wanted to tip I didn’t know what so I said $15 cause I don’t really understand it and that’s the max I could spend well she misheard me and charge me $50 which I know sounds similar but how do hair stylist make their money? Do I even have to tip when it’s already over 2,000?? I don’t want to shit on my stylist because I used to be a waitress I know how that is but I don’t know how hair and nail salons pay please if anyone knows please educate me so I don’t be a shitty person