The only thing this poll is showing is the amount of free time and disposable income each member has. It takes time and money to dive. It takes a huge amount to travel or other continents for diving.
All my income as a divebum is disposed of in food, the mortgage, etc. However, I can travel pretty darned cheap.
For example my nearly 3 month trip through Asia (Taiwan, Hong Kong, Bangkok, Malaysia), Australia & New Zealand and the Pacific (Cook Islands, Fiji, Tahiti) cost a mere $4,500 all inclusive (airfare, accommodations, meals, diving, gifts, etc.). My three month trip through Europe, admittedly done several decades ago in the late 60s, was a mere $750 all inclusive.