Hi JavissDaviss,
UK based answer - and I'm making an assumption you're a student, or newly into the job market?
Yes, it is. At the start, it's hard. I kept a casual crewing job on the side for the first 12-15 months, because I wasn't confident I could survive without it.
I'm 2 years out of uni, and I'm hovering around the £20k mark. But don't get me wrong, it's hard. I have no savings, I have to do a lot of scrounging, and there are times I have to get by with £3.12 in my bank for a week while I'm waiting on invoices. I should say that I'm not fantastic with money - if I banned myself from Starbuck and Pret, I'd be in a much healthier position!
However - until you/we have a few more years under our belts, there's not going to be decent money (and I mean decent for Stage Management in London here). There's still a lot of people around with similar skills, age, experience, and so the only thing to set us apart from our peers are the friends and contact we have. Also, W/E, or full-time at the national houses are where the money, security and benefits lie!
I'm happy to answer any further questions for you - if you like, my contact details are on my profile (I think)!
C