When you purchase a gift certificate for someone, that's of a substantial value and is a service that involves tipping (a salon....so let's say $50 and above) - do you also include money for the tip?
I wouldn't have, but then I've also never given a g.c like that and more wouldn't have thought of it, than purposely not included a tip.
The closest I've come is giving a g.c. for a restaurant. And I just get a g.c. for the amount I want to gift, ie $25 or $50. But I appreciate that is different than a g.c. for something where the service is already a specific amount, ie a massage or facial.
I get my mom pedicure gift cards, but we always go together so I just give the tip for both of us. I've also run into places that won't let you use the gift card for the tip. If it was a gift card for a spa that does multiple services, I wouldn't find it odd. If it was for a specific service, yeah include the tip.