Extended Warranties
Well denisec you should have got the message by now.
One thing I would add to combo's comment above is that most of these 'extended warranties' only go on for so long and should your machine still be working at the end of it, and you have paid for the extended warranty very likely you have nothing to show for the cash (in the case of Sears MPA you are entitled to one check up visit per year but viewing many posts on the subject good luck on them showing up when they say they will, for the check up, or a repair call).
It is a gamble I know but these companies do not offer these scams, sorry schemes, because they are 'nice guys' but to make money, and who are they making money from?
They are gambling that only so many of the machines will require repairs (cost them money) and what they have taken in with the scheme will pay for that and leave a very healthy profit.
One other point with these schemes is that you are, in effect, giving the company an 'interest free loan'. You pay up front for this 'service'. The company has the use of your money, interest free, until such time as repairs are required. During that period of time this means that their short term borrowing needs (usually taken care of by a line of credit, or something similar), are reduced by what you have given them. This will of course 'improved the bottom line' at financial reporting time.