Definately. I don't do much business during Christmas really. Generally, I have a free balloon day or weekend - where I twist for free for a few hours a day for kids in the community. At best, I may make a twenty in tip. It does give me the chance to get my business card into hundred of hands though, so it's not a bad trade-off.
I've found Valentine's Day to be a great seller though. With florists jumping a dozen roses to nearly a hundred bucks; it's not a bad idea to offer an alternative that can last just as long as the flowers - at half the price or less. Sometime's change is a good thing - a dozen roses year after year can be old - most people stop getting balloons once they reach adult age - tragic! We can change that..
Valentine's day is probably my biggest business day that I can count on yearly.