Something else - is there a reason for the turnover in this industry? There always seems to be more than a few rounds for sale, most of which haven't been built up too much.
The honest answer to this is that the job just doesn't suit everyone, but of course there is only one way to find out...

Why doesn't it suit everyone?
It can get cold, very cold - wear several thin layers
It can be boring - an mp3 player helps
Some consider it low status work - who cares? let them work for someone else if they want.
It can get lonely - but not if you're an anti-social old git like me, I love working on my own.
You have to be self motivating, or you'll end up doing almost nothing
DONT WORK CHEAPLY, you'll fill your time, but not your pockets.
Buy some basic kit and practice on your own windows for an hour or two..