They're doing their best to encourage people to help with their database by doing the challenges. The $5 per 10,000 points promo didn't seem to go over very well. I tried it but by around 2600 points I decided it wasn't worth the time for just five bucks.
A few days ago they brought back the $1 per 1000 points promo, "but just for a limited time". I've been able to accumulate a few bucks, but my fastest time is still almost twice the current record.
Anyone else doing the challenges? [MENTION=4428]MrMet[/MENTION]?