Ummm no, they are not. I bough a lot of Lv. X's like Empoleon, Torterra, Lucario, Honchkrow, Hippowdon at that price already! And Ex's are worth like nothing nowadays!
There is no Lv. X which is worth $50 right now, the highest is Luxray Lv. X which is about $35.
So unless you are willing to...