Mobile covers and economic theory!

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About a year and a half back, bought a cover for my mobile from one of those ubiquitous small shops in Mumbai; it's a very hardy 'unstylish' cover and will probably last many more years. Every few days, the cover gets very dirty and I have to clean it.
It appeared very dirty today and had to clean it before dinner, that set me thinking...

The mobile is still almost in the brand new condition. Yet the cover gets dirty very often and that means for me, the mobile is dirty very often...and I'm sure one fine morning I'll find the mobile has stopped working...so in trying to keep it clean, I'll end up having used a dirty mobile throughout its working life, though it will die a clean death :-).

Irrespective of what Economics says about "savings-postponement of consumption-consumption" for 'rational' human beings, I haven't found a model which works for an 'irrational' ,'real' being like me.

Do you know of any?