Matching tyres, front & rear, Why?

Sorry to put you all through another tyre question but I have heard that it is preferable to match your front and rear tyres?
Do you have to match them? Usually the rear wears quicker, so should I source another tyre the same as whats already there?
The factory tyre that came with my 1250 Bandit was a Dunlop Sportmax 218, they seem to grip ok but wear quickly, as I have only done 3700kms on them.
Any thoughts appreciated.
Do you have to match them? Usually the rear wears quicker, so should I source another tyre the same as whats already there?
The factory tyre that came with my 1250 Bandit was a Dunlop Sportmax 218, they seem to grip ok but wear quickly, as I have only done 3700kms on them.
Any thoughts appreciated.
