Why $6.99?

My 2 year old son loves this game, and I would be willing to upgrade for a minimal fee, but not $6.99! That stinks. Toddlers lose interest so quickly, so I cannot justify paying $6.99 for a game every time he wants something new.
4 stars for the game -1 for the price tag!

Azmom99 about Chuggington Traintastic