Ok so the title is confusing, i didn't know what to write.
Anyway, most people believe that if you ally with someone, and then you beat an enemy, you both get the full half of your enemies sp, this is wrong.
eg. 3 people ally and beat 1 person who ends up with 300 sp.
most people think: everyone gets and extra 150sp
in reality: everyone gets an extra 50sp, the 150sp is shared equally between the allies, so in this case, the dude with 300sp probably had more fun, and got the same sp as those who allied against him, so lost nothing.
There needs to be a notification, when someone proposes an alliance, that the half of your enemies sp will be shared equally between your allies. (you will still keep all of your earned sp though of course.)
Also, now everyone understands why there are so many traitors in the game, and i hope this info creates much more interesting games. Thanks