I don't want to stop. I want to be in control of the punting, rather than punting contolling me.
That's the key thing; it's awfully easy [particularly for someone either in his early days - "kid in a sweetshop" phase - of punting, or who's let himself succumb to Emotional Attachment Syndrome] to let the punting control him.
Basically, imo, it comes down to willpower; because I've read too much stuff on Message Boards like this over the years from punters in one or other of those categories who've let it bring big trouble to them and, arguably more importantly, their families.
You have to set a punting budget and stick to it. And no matter how attractive a proposition an individual WG may appear or how good a recommendation you get in a PM on here, if she's going to take you over that month's punting budget, then postpone her to a month when you know you can afford her.