Yeah you run the risk if you're using the secondary sites. There's always tonnes of Americans at the game whose ticket they bought on stubhub etc don't work and they go to the ticket office who can't help them.
Hopefully with them getting on top of bots the ticket exchange might actually become useful because atm they just get instantly sold to whichever tout has the fastest software.
It does annoy me massively that where i sit there's 3 season tickets a couple of rows in front and that every single week it's a different set of tourists in. It's been reported to the club on more than one occasion but they've been very slow to act.
There's also the facebook group that boasts they have 100+ season tickets. Everyone knows but the club seems painfully slow in sorting it.