It's up to the person how he/she spends their money. If they didn't have it they wouldn't spend it. There are more expensive hobbies out there, classic car restoration for example. You can have fun with a set for 60 quid if that's all you can do.
I do feel a tad uncomfortable about the topic as how people spend their money to acquire their collections is ultimately their business and may not want attention drawn to it. However, I'll leave it open for now if the discussion takes a sensible route. I certainly don't want to think about what I've spent over the years personally!