Shacknews has word from publisher Nobilis that the PS3 edition of Trine will be half the $40.00 MSRP of the PC edition of Frozenbyte's upcoming fantasy-themed action/platformer for which a playable demo was just released. It should be noted that many listings for the PC edition of Trine do have a lower price point, but the $29.99 listed on Steam is still 50% above the PS3 MSRP. There is an discussion of pricing from Frozenbyte on the Frozenbyte Community Forums:

I'm sure the price will be something what will generate a lot of discussion. While guidelines are set by our publisher, in my opinion price around $/€ 30 is very reasonable for a game which production values are very close to a retail title. While we are labeled indie as developers, Trine is far from a game created by a solo hero developer (we have over 20 employees and Trine has contributions from a double amount of people). We are very confident that we can deliver a full retail experience with Trine (hence PC version is sold in retail also for approx 35 to 40 eur/usd!).

However, if players, sales and press show we are wrong we will definitely check the pricing. In the meantime, please check out the $/€ 0,00 demo, add a total of 15 levels and judge by yourself!