pipedope:Add in the cost of all of your gear, don't forget training and all of the other little costs that go in there.
Then again, diving is not about the cost, it is about the rewards.
What training?
If I put in my training and gear costs, it would be continually going down, i.e. dive one would have cost me $370, dive two would now be down to 80%, etc., in a continous depreciation due to the supply of dives starting catching up to the demand, such is the basic premise for modern economics: Supply & Demand will balance out somewhere. If I factor in my current gear, and I do own all my own gear, the dives are close to $30 each right now. By summers end, unless something drastic changes it will be down to roughly $20 or less... probably about the same as now.
Unless I buy something else in while in the continuous quest to perfect my own diving technique.