I hear you.
At one time, a few years ago, I was getting out of control too. Sometimes going to an MP 3 or 4 times a week and even when I wasn't, I was thinking about it. Definitely 2 times a week.
I don't think I actually ever kept acurate track of the money, but I was definitely doing the mental addition.
It got to a point where I literally had to start fighting the urge to go.
The best way I found to stop going was to give myself something else to do in my spare time (usually when I would partake in the hobby, but not always).
If I got busy on another project, I would lose interest in going.
Now, I would say my "hobbying" is at a completely acceptable and managable level. At most, twice a month I would say, at the least, once every 2 months or 3 months.
I read a review on massageplanet.net one time by a guy who said that he opened a separate bank account and every time he felt the urge to go, he would transfer X dollars (whatever he figured he would have spent) into that account).
I think he said he bought a harley after 2 years.
One thing you could try doing is masturbating when you have the urge to kill the urge.