Side story:
I spilled coffee on a new Vaio laptop in 2001. I called Sony and confessed immediately. They took note, asked me to send it in to a service center, and then called me after receiving it. They stated that because I told the truth, rather than be out $1,800, they would charge me $150 plus shipping to completely replace the device. That is when they told me about all the water damage indicators throughout the device, and how often they get customers denying that they were the cause.
Sony treated me very well. So did my concience.
So many people underestimate the value of honesty. My cat recently knocked a mug of coffee over my mothers laptop, kaput, local repair shops were asking almost £500 to repair it, so my father phoned John Lewis, and they said send it in, we'll see what can be done, we'll be in touch. About 2 weeks later it was completely repaired, all data still there, and didn't cost a penny. Same kind of thing happened with my partners iphone, years out of warranty, had bought it second hand, yet she went to the store, asked nicely and told the truth, and she got a brand new replacement when they had no reason to give her one. People value honesty, which in turn works to your advantage, which then will very likely make you a loyal customer, this is a good thing for the company
As said by others in this thread with regard to manufacturers knowing all the tricks, in any business, if a company realises you're trying to screw with them, you're not gonna have a good experience with them from there on out.