I'm an all around guy. I'm known as a card magician, but in my show I only do 1 card trick; the rest are coins, paper balls, sponge balls, rope, newspaper, etc. I believed that magic is limitless; therefore, I should be able to do magic with everything.
I second my friend Tricky Devil.
It is in fact VERY GOOD to be an all around magician. Some don't like card tricks, some don't like rubber band tricks. And if you only do let's say card tricks people can get bored. It is good to be an all around magician. That way there is something that your audience might like and you have a good variety.