Dude... you can turn off the logo :-)

On top of that, a few points. Absolutely, it costs a ton of money to be able to offer this data. People have to make a living somehow.

Lastly, we're not likely to ever charge for what you're seeing (the airpor inbound traffic) - in fact we hope to continue to add additional airports (it's our plan). We'll probably create OTHER services that will require a subscription (in fact we already have some services that use Google Earth that require a subscription)... people work with us as their job, they all have to earn money so they can feed their families, in the same way which - I'm sure - you work to pay for yourself.

I hardly think a logo in the corner consitutes SPAM.