I've eaten steak three times since like 1995. I would love to eat it twice a week. It's not the expense that keeps me, just that I am just now getting back into eating much meat. We mostly just do chicken or turkey in our house, but honestly poultry makes me gag lately.
I say if you want it three times a week, why not? How is it a waste of money? You're eating it and not throwing it out.