Sounds like he (or she) didn't know what they had, and you took advantage of that.
I'm not sure there are many 'new friends' who would knowingly exchange a $3000(ish) system for s $150 system (no matter the cosmetics).
It would be interesting to hear your 'friends' take on the deal, why not invite them to comment?
Saying all that, stranger things have happened, and the human condition does allow for the most extraordinary acts of generosity and self sacrifice, so it is possible.
Plus they got a system they actually wanted.
In which case, well done on a satisfactory deal all round.
I'm sure you'll enjoy it.