As Dr Bill has stated, this sport is as expensive as you want to make it. The manufacturers will tell you that you need all the bells and whistles and more. It would be very easy to spend $3K-$4K on gear that seems necessary but is not. In reality you need mask, fins, snorkel, bcd, smb's, watch, regs, wetsuit, maybe a dry suit and maybe some tanks if you can't rent them. You could probably, without the dry suit, buy it all for $1000-$1200 and make it last at least a decade, and most likely longer, with proper maintenance. The cost of a good set of golf clubs is higher than that and so is the gear for rock climbing, whitewater rafting and many other adventure sports. This may be the crux of the problem, the sense that this is a very expensive sport. Consider a 2 tank dive is ~$100 and will take maybe 4-5 hours out of your day. We pay way more for a concert or a sporting event. Plus we get to see so many cool things other people can only dream about.
RichH
RichH