Nothing, you just stay last prestige. But everyone knows your some pimp pro so its cool.
Not besides bragging rights.
Depending on the COD, it changes the amount of levels they earned. COD4: 55 levels COD5 WAW: 65 levels COD MW2: 70 levels Each prestige has a certain amount of levels needed before going into the next prestige. In MW2 its 70 levels, then prestige, then 70 more levels. Since you need to reach the highest rank before prestige 1 there is actually COD4: 555 levels total as a tenth prestige. COD5 WAW: 715 levels total as a tenth prestige. COD MW2: 770 levels total as a tenth prestige. Lots and lots of games played :)
prestige
It changes after you have reached level 55 in multiplayer and have chosen the Prestige Mode option.
play for 10 days
Yes and you get 1 token for prestiging at least once in CoD4 CoD5 MW2 and BLOPS
The only thing going to tenth prestige does is get you more titles and emblems, bragging rights, and prestige tokens. If you are not interested in either of these, there is really no point.
To tenth prestige you have to prestige ten times
yes
Prestige 10 times funnily enough
To reset your stats you must be Tenth Prestige Level 80 and have a prestige token.
no