M isnt perfect to represent the stacks.

[valenzuela]

At first we had Big blinds. But the problem with BBs is that they dont take antes into account, then harrington came with M so that we cant take antes into account, however the M doesnt perfectly represent the situation of youre stack, here is why.
Suppose we are playing on a 9 handed table, the average stack is 180000.
The blinds are 5000/10000.
The blinds are 2600/5200 with an ante of 800.
The latter situation has much more play than the first.In the first situation you have to raise 300000 preflop, in the second situation a 17000ish bet should do.