I think that was a good perk to plus members so they got a little something extra while the free access was running. It was a good sale.
Now that I've had a chance to play with five crates, here's my assessment of value. I'd personally play the crate game for a price of 50 crowns per crate, or 250 for the five pack I got. That'd be a stretch in price, but if there was stuff I really wanted that's what I'd pay.
I understand it's 1/6th the current price. That's why I don't buy crates, lol...but this sale allowed me to assess that I'd buy them for 50 per pop.