According to an oldish survey I found here (a couple of months old) in the UK it costs an average punter 1,310 pounds a season on average to follow a top flight team, get the latest kit but not follow the team to European matches.
This seems quite pricey to me (I think it includes away match tickets as well) but it made me think of figuring out how much it costs to be a Gencler fan. Obviously this little survey can't be directly compared to the English one but anyway.
Season ticket for Maraton: 105 tl
Bus to Chopin bar (1 tl times 17 home matches): 17 tl
Three beers at Chopin (2.50 tl each times 17 home matches): 127.50 tl
Kofte lunch at Chopin (5 tl per match): 85 tl
Shared taxi to the stadium (average of about 2tl per match): 34 tl
Average amount of money lost after coins and or lighters are confiscated by police (1 tl per match): 17 tl
shared taxi back to bar (same as above): 34 tl
Three more beers post match times 17 matches: 127.50 tl
Taxi back home (5tl times per match): 85 tl
Brings us to a grand total of: 632 tl (or around 232 pounds, 346 euros)
All up, money well spent I'd say.