Welcome BigJohnny.
I think there are perhaps two ways in which you can stop without having to shuffle off your mortal coil:
1. Needing to spend your discretionary (coin) cash on something else - e.g. moving house, changing your car, family changes, or by being out of work (like me at the moment)
2. Setting yourself a simple-ish collecting goal, completing it, and then resisting the temptation to set another. Possible, but good luck with that one
In reality I think most people either have the collecting gene or they don't. The more time you spend on here, not only the more you learn, but you also see pictures of some lovely coins that sparks a desire to save up for something similar yourself!