The only affect of bunching a common fed setup like that for me is to maybe broaden the bandwidth some and I think it is just as Jeff states. But I don't know why this penchant for broadbandedness either since the same bunch that calls for this also hollers maximum gain and power and match and every thing else all in the same breath. It's like it all comes together over there on their funny little setups that are different from everyone else.
It is mostly just about being different, and making the other guy wonder, what the heck am I missing out on now.
That is how Eve tempted Adam, don't you know. Promisses, promisses, BS promisses.