If you're married and have kids...buy as much as you can as fast as you can...guns, gear, kit. Do so before your significant other has a full comprehension of how much you've spent on your new hobby...just so you can go "play with your friends". Because they'll try to shunt the spending to something that you can "share". Some guys play airsoft with their wives...that's cool...I don't.
Once you've got that base money sunk in...you can trade/sell what you can part with and buy/trade what you figure out that you need. Be smart and that same initial amount can go a long, long way for a long, long time.
I think Crunchmeister went that route...but he hasn't stopped yet or else his wife doesn't look at the finances that closely!
Anyway...yes...airsoft is expensive, don't dwell on it.