cheap tyres for my cars

I can easily tell you right now, without any shame, that I am a person who tends to buy cheap stuff. I can admit it and I know about it, but I still do it. I mean, I think I am addicted to it. I earn quite decent money and I tend to spend my payouts on utterly redundant items. Frankly speaking, I do not plan to do it. I simply finish my work and go to shop in order to buy something to eat. Then I notice something which I like and if it is cheap I am getting it instantly. This is somehow stupid because I could easily buy something better because I end up buying several cheap items which is equal to buying a more expensive one, for instance. I know that this is quite weird but i guess that I will not change anymore. A couple of days ago I found a massive sale of tyres. They were selling really cheap tyres for any car. I have two cars in my house. Believe me or not, I bought two sets of cheap tyres for each car. Just in case... or I should say... just because they were cheap. I do not know whether I should talk with psychiatrist about that but I guess this is not normal, is it? I mean, I am not doing anything wrong by buying this cheap stuff but I cannot seem to control myself at times.