Why not? If that's something you have a passion for and you love to do, then go for it.
That's how Michael Dell got started.
Read this
http://www.amazon.com/Direct-Dell-St.../dp/0887309151
He pretty much mapped out how he got built Dell from scratch. If it inspires you then do it.
One thing I learned in life is to do something you fucking love to do, and forget about the money. And
then the money will come.
Just have a good and professional attitude in your business. So many tech support guys treat their customers like shit. If you give good service with a smile you'll build a big business in no time.