A Photographic Coin?! Huh?

I bought this photographic coin back in 2015. It's legal tender, worth £5! It's 24-Carat Gold-Plated Copper (so not worth any more than face value). I'm pretty sure I paid £5 for it which isn't that bad really. I can always spend it if I get bored of it (not going to happen!). It's so cool! Only 30,000 were issued and I'm not even sure if that was a lot that's how inexperienced I am however... when I'm 90 years old I've got a feeling it's going to be worth AT LEAST... £6.