Is system synergy worth having matched components?

Often the truth is some manufacturers "add" other components to their lines for a brand and sales benefit, when their core skillset or best product is one particular type of component.  

Nothing in my system is brand matched, and I would have it no other way. 

@holmz

For my approach I would use my last purchase as an example. I was searching for a tube based preamp to upgrade from a less expensive model and did not want simply hit or miss by experimentation. I researched my amplifier online and found a fellow who works for Fairaudio.de , a german based audio publication and component review group similar to Stereophile. He does this for a living and he paired the preamp I was considering (EAR yoshino 868) with the Bryston 4B3 and was still using it several years later in his reference test system. I wrote him a letter, and he responded, giving me enough valuable information to know the synergy between the two was what I was looking for. I did not have to reinvent the wheel. I was also able to confirm the pairing with the fellow I purchased the preamp from as well.