Best time to buy/sell to upgrade MBP?

hey guys,

have 17" 2011 mbp (2.3ghz i7, 8gb ram, 512gb ssd, 1tb optibay) , i'm curious when , guys go sell/upgrade mbp's when time comes. i've decided want sell , upgrade when major new upgrade comes mbp's instead of testing see how long can make setup last. reliable way sell when time comes, , how end spending in difference cost of selling , buying new setup? know there's no way tell future, typically new models come in @ around same price past years.



input!

 

craigslist.

lose between 10% , 25% of paid. macbook pro doesn't lose value, upgrades are. might want keep ssd next mbp.

 

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