Welcome to the forum Dimesy.
I can see where this could be good for playing cards while traveling, but to be honest, I really don't see any other uses. It really doesn't work for trading card gamers. They use more than 1 standard deck, and games like UNO are the same. So it wouldn't be big enough for that. Most people that play cards at home don't use trays. The only reason I used a tray with UNO, was it came with the game.
If this doesn't fund this time. Maybe change the focus to a custom set of cards that include a case that turns into a tray