What is the reason behind proper mass being invariant?

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we know proper mass is always constant irrespective of frame ie its invariant(and conserved if I can say).so what's reason for this proper mass.?
 
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The reason it is important to use proper mass is well described in wikipedia:
http://en.wikipedia.org/wiki/Invariant_mass

... generally it is useful to look for things that all observers can agree on - it makes the math simpler.
 

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