This is only my 2nd time as GM and I suffered from some confusion last year. I've charged an extra $2/player for each of my games this year. It's a 3-hour game, and its price is listed as $6. Therefore, I should be collecting 3 tickets from each player whether they're registered or have generics, correct?
If they’ve purchased a ticket to your event, they paid the full price. You collect the one $6 ticket.
If they have generics, you collect 3. Note that if they are using a ticket from a different event, it counts up to its face value. So, if they have a $4 event ticket, you collect it and one generic. If they have an $8 ticket, you take it, but they don’t get “change”. They could also use the $8 ticket plus 2 generics to cover the cost of two people at your event.