I might of been out of the sport years ago if it wasn't for the amount of money I pumped into it.
In hind sight I should have just done Open Water and Advanced, owned my own wetsuit, snorkel, mask, fins, weight belt which I can use for snorkeling anyway, and maybe just hired the tanks, regs & BCD.
I have all my own gear so I stayed with it to get my money's worth out of it, and even know it doesn't take long for gear to become obsolete.
Personally I can see value in the Advanced and Rescue Divers, but unless I was working in the industry, I wouldn't have done any more courses after that ( just my own personal opinion).
I enjoy the simplicity of free diving with or without a speargun. Sometimes I just enjoy putting on my free diving fins, mask, snorkel and head out with nothing more than an underwater camera.
I do like the idea of trying to develop oneself in apnea diving, diving deeper and longer within a safety margin. Always best to go with a safety number for shallow water blackout etc.
Cheers
Campfire