yeah u only get ~50% of exp from what you would get in a battle server with x2 for one hour, tested it many times now, always ends up like this.
cus it takes to much time to kill all bots, cus they spawn to far away and also often bug and stand still and u end up getting to little exp.
same goes for the money, gain is very little, but repair is pretty much the same, so u end up loosing more money then in battle servers.
it's pretty much a for the lulz mode.