Probably looks, wealth, social standing etc. Swingers parties are for couples, not singles, it would just be a sausage fest if no women were to go and only single men did
Same with a Lexus E350 and Toyota Avalon. I'm interested in the comfort and options. Am I really getting something different when I pay more for the Lexus or Lincoln logo. The bodies are virtually identical and they offer similar options just with different names.