Cheating = Wearing a wig

Bukhari, Volume 7, Book 72, Number 821:
Narrated Sa'id bin Al-Musaiyab:
Mu'awiya came to Medina for the last time and delivered a sermon. He took out a tuft of hair and said, "I thought that none used to do this (i.e. use false hair) except Jews. The Prophet labelled such practice, (i.e. the use of false hair), as cheating.

1) When Mohammad (may peace be upon him) was giving business advice, and said no cheating, did he mean not to use wigs?
http://muslimhadith.blogspot.com/2008/05/when-you-bargain-say-no-cheating.html

2) If using a wig is cheating, then what about dying one's hair?
a) Wouldnt that also be considered cheating?

"Bukhari: Volume 7, Book 72, Number 786: Narrated Abu Huraira :The Prophet said, "Jews and Christians do not dye their hair so you should do the opposite of what they do. ""

http://muslimhadith.blogspot.com/2008/09/muslims-should-do-opposite-of-what-jews.html

b) Would that make Mohammad (may peace be upon him) a cheater?

3) If Jews and Christians dont use wigs, does this mean that Muslims should wear wigs, even if it means they would be considered cheaters?