I have no clue. My mother was a teacher and my dad worked in a factory assembly line. Neither them or any of my grandparents had ever even considered university, but then very few in our town did. We lived in a two-up, two-down and my parents paid a longterm mortgage rather than rent. We never had foreign holidays or pocket money or anything. On the other hand, I went to dance lessons and at Christmas I always got a real Barbie, while some of my friends got cheaper imitation dolls, so relatively speaking we were the posh kids? I now have two higher degrees thanks to scholarships all the way, and am broke and unemployed. I don't know how you fit any of that into a proper bracket...
For me I think it's made a difference to the fandoms I've been in. All my fandoms have been for books or for shows that aired on my countries basic/free stations. I've never been in a fandom where the canon costs more than the price of a few paperbacks or (back in the day) video cassettes to tape it off the telly. And I've never bought any merch. But I don't feel I've particularly missed out?
Re: Socio-economic Class
For me I think it's made a difference to the fandoms I've been in. All my fandoms have been for books or for shows that aired on my countries basic/free stations. I've never been in a fandom where the canon costs more than the price of a few paperbacks or (back in the day) video cassettes to tape it off the telly. And I've never bought any merch. But I don't feel I've particularly missed out?