Look at the cascading dangers from giving gift cards to your volunteers discussed in a post “Can Gift Cards Jeopardize Your Volunteer Force?” from Katie Thomas, CPA at Nonprofit GPS
The answer to the question is “yes”, by the way. Check out the post. It’s great.
Well, actually you may find it to be very depressing if you say “thank you” to your volunteers using gift cards.
I have more discussion in my posts here and here. That first post links to another discussion by Ms. Thomas.