All iPod Touch major updates are paid....all OSX major updates are paid...why would the iPad be any different? You don't pay a maintenance fee for the device to keep it readily up to date and Apple has no obligation to give you new features for free.
Snow Leopard was only $30 to entice new users since Tiger support is done and Leopard will be dead soon.
Maybe someone already mentioned this, but if not...
I am OK with paying for updates that offer increased functionality, provided security/bug fixes and maintenance updates remain free.
HOWEVER, I do NOT want to see Ads popping up in my OS apps as it sounds like they will be soon. While I love the user experience of Apple products, I am becoming increasing disturbed by Mr. Jobs business model of snookering you in on a paid product or service and then locking out the competition while force feeding unwanted advertising and leaving you only 2 options - opt in or stop using the product that you paid a premium for in the first place.
Maybe my understanding is off base, but that's where I'm at.
I think the ads would only appear in Apps, and at this point I see more ads in the Jailbreak software than anywhere.
I don't think you would have to stop using a device, just the 'free' app that has annoying ads in it.
I typically delete an app the first time I find an ad in it, I have no problem paying for an ap, but will not tolerate ads in them.
I am not opposed to dropping $10 for further upgrades beyond OS 4.0
Even software upgrades for desktops incur fees at some point. Apple OSx Leopard was only $29, MS is getting $69 - $114 for Windows 7 upgrade.
Most likely written on my iPad
64 Gb iPad Wi-Fi
MacBook 13" 2nd Generation
Airport Express (for streaming music)
iPod Nano 3rd Generation
Tons of Windows PC's
Linux server running CentOS
Ofcourse there had to be a fee for upgrading the software, but regardless it shouldn't matter because the next upgrades are going to make the iPad soo much better..
Things may have changed. When steve anounced the new iPhone 4 he said that they "came up with a way" to allow the new iOS 4 for all devices for free.
iPod Touch devices used to be charged for major updates but now with the iOS devices being so popular and with the number of iPads sold apple may now be making all the future updates free just like they did with the iPhone.