Not a probablity question, more like a math/poker question

[flopdanutz]

I am playing online and I see the guy to my left never posts a big/small blind but always posts behind the button. Since there is no penalty for sitting out (posting big +small) the player basically pays 1 big blind to see 7 hands while all the other players pay 1.5 big blinds to see 10 hands.

When one player sits out that player pays 1 big blind to see 6 hands and the other players pay 1.5 to see 9 hands. So mathematically all players pay the same per hand.

Question: is it a good idea to post behind the button online when 10 handed since it is cheaper per hand although u have to sit out for 3 hands?

Against this player I raised when he posted and stole twice, with TJs and 88 (not sure if u guys consider that a steal)

if you did only post behind the buttonin a 10 handed online game then how would u adjust?