WP costs were designed to be one of the gold sinks in the game to remove gold form the economy to control inflation. To have this ticket available would get rid of that gold sink and ultimately hurt the economy which would be worse than the bit of extra money that would be made from people buying gems to acquire it.
I understand what your trying to do with this suggestion but think you should think through the ripple effect it could have some more.
I think giving tickets out would make people spend more money.
For example, I never take waypoints with my level 80, but I always use them for travel with my level 38.
If they put tickets, people would spend more money on the ticket than what they spend on travelling now, just because now people avoids waypoints. With these tickets, people would use waypoints much more. Right now, I never use waypoints, only one when I need to get to Orr, and I'm usually always there. With a transit ticket, I would travel around much more. So, from spending 0-2 silver daily, I would spend the ticket's price, much more higher for sure, and the game would benefit from the higher player traffic across the different zones.
Gold sink-wise, it would help remove more gold from the game. However, making it be long-time-based is a bad idea, in my opinion, because people would overuse waypoints and not walk anymore. So, to make it viable, it should be 24h only or x uses only. The 24h version is fine for me. Make it be 10 silver or something like that.