Airport Lounges

I have private banking. I travel a lot and cannot go and sit in Airport lounges without paying. My private banker's solution for this is to get a Diner's club credit card. The criteria from Diner's club to get access to their lounges is to spend at least R12000 every three months on the card. I don't want to get another credit card just to be able to sit in a lounge. Why can FNB clients just go and sit in SLOW lounges if they just have a normal bank card and not even private banking??? I am very disappointed.