2 Answers

It matters, read about it here >http://www.bigsiteofamazingfacts.com/what-is-matter-and-why-is-it-important

mat·ter
/?mat?r/
Noun
Physical substance in general, as distinct from mind and spirit; (in physics) that which occupies space and possesses rest mass, esp. as...
Verb
Be of importance; have significance: "what did it matter to them?".
Synonyms
noun. substance - affair - thing - material - subject - case
verb. signify - import - mean - suppurate - fester - count

It would appear that matter is that which we can see, like other people, and everything tangible, animate or inanimate.    How important all that is....is up to you.  It's nice for me to be able to actually SEE and TOUCH the refrigerator door, open it and remove stuff I can SEE and TOUCH and EAT. 

That is one reason matter is important.