Most of the fanboys always buy something at the start... Spore has few drm fanboys.
If you equate history, stats of pro-drm versus anti-drm users, and huge amount of pirated copies, it's safe to say spore is about to quickly go down FAST in popularity, as the pro-drm buyers should be close to finishing.
Honestly, I predict 100,000 copies sold, maybe more. The spore saga will probably get pretty hilarious soon.