I beg to differ. Even if you're fluent in ASL and are completely confident with your skills, taking a language and translating it is hard. Even if the thought process comes naturally, it's still hard to sit in a lecture for 2 hours and sign without a break.
Also, let's not jump to conclusions about why people become interpreters. Not all are in it for the money. Some, like myself, do it because they enjoy it. I get paid crap to work in a highly stressful environment, but I do it because I love interpreting and I love the kids I work with.
Certification means more job opportunities.
