Just responding to the OP without reading the thread so I'm sure some of this is redundant, but my take:
Bottom line - this stuff isn't cheap. You're the only one who can decide whether or not it's worthwhile. Just don't half-ass it. That's one way people get hurt.
Significant. $3-5k will get you started - depending where you are relative to your instructor that number goes up quickly with travel costs. As your diving takes you further the tab will go up. Between the wife and I and the gas blending system we've got probably close to six figures tied up in our hobby between gear and training.1. what kind of gear investment are we looking at?
Will you be doing dives where you'll have eight tanks? Probably not. 3 or 4 is probably a reasonable expectation for dives shallower than 200 feet, which is where you'll start.Is it necessary to own 8 different regulator sets etc?
If you service them annually. A lot of people service regs when they need servicing. But yes, you will have to have an expectation that you'll need to maintain your equipment.It is understandable to collect gear as you go up in training experience but if you get 6 different regulators serviced annually, that alone is a lot of money. No?
I don't know that all tech divers are extremely rich people, but you don't do this stuff if you can't afford it. I would say that every one of the tech divers I know locally has a very good job and an enviable degree of freedom. Some of them are professionals as you suggest, others simply prioritize their hobby above other things in order to make their activity financially possible.Are all tech guys extremely rich people? (Doctors, CEO, dentists etc)
It will vary depending on where you are and how far you have to go. The most recent charter I did was a wreck at 280' and another the next day at 330' (that's two dives) for ~$600 (food included, gas fills not included). For an open circuit diver on that trip with a tip you're healthily approaching ~$1200-1500 for the weekend. If tropical tech diving charters are your thing you can look up boat and gas prices in Truck or Bikini.2. How much does a typical tech charter cost?
Gas will be priced at the cubic foot generally based on what it costs your blender to get the gas and how motivated they are to pump it for you. A lot of people (myself included) opt to take this on ourselves for convenience reasons that are rarely economically beneficial.3. What about gas fills? I pay 13 dollars for nitrox fills so how much would helium and trimix etc cost?
Depending on the dive there are consumable costs. Cave line, oxygen sensors, gas analyzers, lots and lots of tank maintenance (~24 tanks presently that need VIP and hydro, etc).Any other hidden costs? Thanks. I want to do tech but if it means diving less than Id rather stay recreational and just dive more.
Bottom line - this stuff isn't cheap. You're the only one who can decide whether or not it's worthwhile. Just don't half-ass it. That's one way people get hurt.