I think it's hard to pinpoint value through sheer numbers. It's not all about the money. From my perspective, 10€ is not expensive because I get hours upon hours of fun out of it. It's valuable TO ME because my time playing the game is an enjoyable experience. It's satisfying and it takes my mind of the daily struggles. I have a hard time thinking of a thing that would give me such joy for such a long time for just 10€. I mean, would I like more animals for the same price? Absolutely, who wouldn't, but at the same time I'm aware that it's probably not going to change. I don't see Frontier's DLC model for PZ changing. All in all, I never really had issues with the price tag.