Then don't state it as fact.
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plus selling your phone for 400-500 will always be better than junk like this
Where can I sell my two year old iphone6 64gb for $500 net in my pocket with zero risk or hassle?
You're projecting your preferences on others and looking the fool for it.
I tend to upgrade every couple years. If I should happen to upgrade again next year instead of waiting, I'll just shuffle this iphone7 to a non-techie family member who's still happy with her iphone 5s and continue to get the credits.
Not interested in switching to TMO or Verizon or Sprint any time soon; TMO's service sucks at work and the other two suck at home.
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Going for eBay around $400 (give or take).
Which turns into $340 in your pocket and potential risk of a return or buyer charge-back.
Sure, I've used ebay for sixteen years and haven't yet had an issue selling something, but I also am very careful about selling items that are at high risk for fraud.
I'm not dogging you, just adding more info/detail to your post.
End of the day, this is a decent deal for some people and not a great deal for others. If you have a low end iphone6 and aren't likely to take the iphone7 off AT&T for two years it's a pretty good deal. If you have a high end iphone6s+ and plan to upgrade again next year, then it's probably not your best option.
Mature folks can discern that others situations are frequently different from theirs.