I can tell you all you want to know about Best Buy's program because I
use the same company where I work.
They cover a lot of things that make the program a "service." The idea is not that the product will break, but that if it does you are covered. Look at it this way.
On a $4000 Toshiba HD-RPTV it costs roughly $350 for 5 years of coverage. That five years covers parts, labor AND technical assistance. You can call their tech line 24 hours a day and get information on ANY product, not just the one you own. (They have micro-fisch of all manuals)
It also covers the remote control, which is rare. But the #1 reason is prevention. You are paying only $70/yr for the program and they are willing to send a tech out atleast once a year to clean the inside of the set and check its operation (like loose cold solder joints) This would cost you $80-$120 every year if you did it on your own.
Not to mention that MOST manuf. do not pay for in house service anymore. Could you imagine loading that 65 inch Sony into the truck and bringing it to the service center? Thats a $350 value for me right there.
I don;t buy into the program like most people would want me to. (company) but I do know that on RPTV's its a great value. If you don't think so - great. Yes they are profitable - but not as profitable as you would think. Most sales guys make $15-$35 for selling the program, which to me isn't enough to get upset of hostile.
Use your own judgement on this one. I buy them on RPTV's and camcorders.