This looks interesting. I'd defenetly pay you to create my youtube intro and maybe even outro but the letter limit seemed a little bit discouraging since my youtube username is 14 letter long. Does it actually take more time and effort to add more letters? if not then why the limit?
The 7 character maximum is in place due to the fact that anything past that would not look too great and would ultimately lead me to have to do more editing.
Shoot me a PM if you'd like and I can render a few different Intros for you.