I not so sure about these people going 'It's not the money'. No one from the BBC is going to read this forum and go 'This fella will do it for free, lets give him a call'.
You need money to live. As far as I'm concerned I would like to be making money from it. I want it to be my career.
I would say that if or when my career kicks off, it's not going to be a prime time sitcom commission so I wouldn't be able to quit my full time job. Only when my earnings would be more than working full time would I be able to do that.
Working writers seem quite coy about the figures (I never know why people are so coy about wages generally.) It doesn't bother me if people know what I earn in my job in the events industry . . . £14,523 if you're asking . . . And when-if I make it was a writer, be safe in the knowledge I'll be telling everyone how much I earn, because we all want to know. I'm very crass in that respect.