So everyone knows the blind buy model is the devil but I think there can be upsides to it as well.
1. The price of entry might be lower. I expect crap rares and commons to be quite cheap from third party resellers.
2. When you don't have access to all the cards you get more attached to what you do have than if you have all the cards and you could play anything. This one is hard to think of as an upside but it kinda sorta is. There's something kinda fun about having something that others don't have.
3. Better resale value. Unless the game stops being played. Or they power creep the value out of the older cards.
4. It helps the product differentiate itself from all the other products ffg is selling.