Why are there so many unopened amps, ect for sale?


I've noticed a lot, lately, especially McIntosh, ads for new amplifiers, preamps, ect in boxes never opened by non-dealers, just "regular" people. Are people hesitant to buy these. I myself was looking at a new McIntosh MC352 amp from a private seller. He said it's new and the box has never been opened. I'm rather hesitant to buy it, because why would someone buy it, never open it, and then turn around and sell it? I'm just curious. If it is truly new, would McIntosh warranty it; I'm assuming not since it's not coming from a dealer even though the warranty cards are supposed to be inside the unopened box. I truly would like to buy this amp, but am hesitant, and I'm wondering if anyone else has wondered why there are so many unopened boxes of stereo equipment for sale by non-dealers. Usually when we buy equipment from this site we know it's used equipment, unless it's coming from a dealer. Just a curious question and wondering if anyone had feelings on this subject. Thanks.
btstrg
what happened to me when i was looking for a preamp. a guy out of state was selling a well known $3000 preamp for $1500. he stated that it was a year old and never taken out of the box. nervous, i decided to see if he would ship it to the manufacturer, have him check it out before i paid him then have the manufacturer ship the preamp to me.
when talking to the manufacturer he knew the guy that was selling the preamp. come to find out it was a dealer selling through one of his employees so he could sell into another dealers territory. great deal for me.
Just to alleviate 'some' of the fears about this; I had a new CD player that caused me some troubles during the warranty period . After several attempts at repair the company finally sent me a new upgraded model.

As I was not enamored by the old unit to begin with , I sold the replacement for a reduced cost from new . As a result , somebody got a great deal on a NIB CD player with full factory warranty from the manufacturer .

Happy tunes .
I've read a few posts in the past where people have sent their gear in to the manufacturer to be fixed or refurbished and when it comes back gets put up for sale. It is " in an unopened box" but really not at all new.
I'm also suspicious of anyone who suggests the box has never been opened. How hard can it be to open a box, try it then put it back and reseal it. I purchased a reference Audio Research preamp from a pastor that was supposingly factory sealed, it wasn't. Found out later from Audio Research that the tape that sealed the box wasn't theirs.