Both my nephews(age 8 and 12) and myself are bored of the game already after 2 days.
I bought 1 copy and cracked it for my nephews machines (we live in the same house) but I still feel ripped off.
I guess it depends on how you look at it. I've played Spore for about 5 hours so far, and will likely play it for at least 8 more. That makes my total entertainment value about $55 for 13 hours. Or about $4.25 an hour. Considering I spent around $65 for Mass Effect, and played it for 25 or so ($2.60 per hour), Spore was definitely more expensive. But compared to a movie at $8.50 for 2 hours, it was about right. And compared to Gears of War at $65 for 10 hours, it was a bargain (I generally dislike console competitive multiplayer).