I see your point, but the slot machine is a tiny trickle of income compared to the videos -- which still (IMO of course) don't yield enough clintz to really help new players.
I myself am a relatively new player. I was lucky enough to join at a time when you could make a decent amount of credits through free iPhone offers, and later, through video ads. This enabled me to create a collection large enough to experiment and succeed in
ELO. What's more, it enabled me to create that collection through the very enjoyable act of popping open many
packs of cards, as opposed to buying individual cards from the store. Now, I purchase credits regularly, as much to support UR as to expand my collection.
UR is a CCG. As CCG players, most of us enjoy some element of chance in the way we acquire cards. A player that's getting to open a
pack or check to see if he won a great CR is, quite simply, having more fun than a player spinning the reels for what's likely to be a measly 30 clintz, or watching videos for hours just to make a dent in the price of a good card. Maybe as a seasoned player, it's a little harder to appreciate a 1/10,000 chance of getting a card that can buy you a good 75% of the collection, because you already have it... But thinking back to when I was a newbie, the tombola was a welcome sight for that reason, even though I was well aware that the odds were not in my favor.