Disappointed at Cost and In-app purchase

I was so excited to download this, paid the $2.29, completed the first 3 missions - they were pretty decent. Went to try next level... And need to pay another $2.29 for the next three levels?! Seriously?? I dont mind paying for an app, I even will pay for some in-app purchases (ie coins to speed up a task or skip a level) but to pay for new levels? And only three of them? Are V.I.L.E. henchmen at work??

jazzinmarch about Carmen Sandiego Returns-A Global Spy Game for Kids, v1.0