Well, I mean, it was marked in the shop when you actually went to go use the ticket when it expired. And again, now that I think about it, on every single girl you had the choice of picking. Each girl option had the expiry date in the exchange itself also, which is probably why it stuck with me.

Edit: Reading this post, it sounds pretty assholish. I basically mean that you can't really say the devs didn't mark the expiration date somewhere on the ticket, because I'm pretty sure it was marked in three separate places when it would expire. It was my first ticket too and I didn't know they expired, so I can totally understand accidentally letting it expire and then being upset.

But it's not just a newer-player-wouldn't-know type of thing. Myrdin had to ask too and he's been around a while.