Relatively good idea but ineffective. Reason? Google don't/won't give a damn anyway. They simply don't care and buying from another store won't make the slightest bit of difference.
What will make a difference is: Noise. And lots of it.
The only thing I think will work is if everyone who is irritated by the fact that their pre-orders are going to arrive AFTER retail stores stock and sell this device starts getting VERY noisy about it on Google+, facebook, anywhere where there is a community. Google+ would be ideal - there's already noise on there about this farce.
So it is ridiculous that a company can so blatantly alienate it's pre-order (and therefore most likely loyal and fervent) customers who would most likely evangelise about Google, it's services and products. It's the very definition of dumb and the sad truth is that they genuinely don't give a damn. They don't care at all.
I'm very tempted to simply cancel my order because if they don't care enough to organise things so that pre-order customers get their orders first then thank you very much but see you later. It's not a premium tablet and yet, I very much have a case of sour grapes going on here as I'm sure others here can relate too. It doesn't bode well for the ego in me to see that some others have ordered on other websites AND had their devices DELIVERED before Google themselves can even get their ass into gear and organise delivery for their loyal pre-order customer. I have to say - pre-ordering this product at such an early stage is/was genuinely an act of faith in that lots of us who did so didn't have all that much info to go on as to whether this product was any good. It seems that Google, like virtually EVERY other company out there simply doesn't believe or operate with the belief that treating customers well is good business sense - and why should they. They get by just fine without our tablet purchases from them thank you very much. I've invested a lot of time in Google's products and services. I'm a self-confessed, labelled "geek" and believe me - this has me pissed off enough to move to other services, and as the elder-geek in my circle of friends and family, I'd take them with me slowly but surely. Sour grapes indeed.
So: A: Google simply don't care
B: Make some noise!