live 100 - button steals - bad play or bad luck

[iblucky4u2]

Live 100 MTT - myself and the two players on my left had large stacks. Once the blinds reached the 300/600 level I went into steal mode. About every 2-3 orbits when folded to me on the button, I would put in a standard 3x raise with K8s+ type hands. Every time the blinds came over the top all in and I was forced to fold. It was a fairly friendly table and every time they showed me AK, QQ+. By time the blinds reached the 500/1000/100 level, most of my chips were eaten up with this strategy. Is this a leak or just bad luck.