If I just use a DAC, do I need a Pre-amp?

I recently asked a Facebook group this same question.  I should have asked audio forum folks first.  Sorry if there is overlap.

If I only use DACs for my amp, why do I need a Pre-amp?
I have the opportunity to get a nice Fisher 400CX-2...but why?

I have volume control on my Fiio M15, and volume via my player for my Chord Qutest.  How will a pre-amp make things better.  

And JA concludes with

The XP-30 has rekindled for me the concept that the beating heart of an audio system is the preamplifier.
Yes Nelson Pass is in business to make money, even from his preamps, if people want them.

Yet Nelson Pass also quotes this:

Nelson Pass,

“We’ve got lots of gain in our electronics. More gain than some of us need or want. At least 10 db more.

Think of it this way: If you are running your volume control down around 9 o’clock, you are actually throwing away signal level so that a subsequent gain stage can make it back up.

Routinely DIYers opt to make themselves a “passive preamp” - just an input selector and a volume control.

What could be better? Hardly any noise or distortion added by these simple passive parts. No feedback, no worrying about what type of capacitors – just musical perfection.

And yet there are guys out there who don’t care for the result. “It sucks the life out of the music”, is a commonly heard refrain (really - I’m being serious here!). Maybe they are reacting psychologically to the need to turn the volume control up compared to an active preamp.”

Cheers George
A DAC with a volume control built in may be just fine, but then again, it may sound better running through a preamp. It depends on the "match" with the power amp you are using. I run a BelCanto DAC/Pre straight into a pair of Bel Canto mono amps with excellent sound, but they are designed to work together without the need for a preamp. Try before you buy if  you can.
to my ears, preamps impact the system's tone, speed, and resolution. to me and in my system, they have had more dramatic impact than amps (that's not to say that amps and other changes haven't). i picked up a nice soulution pre and am never looking back. i've done the dac with volume control but it's not for me.
Yes you can, but the impedances of the equipment might not match, causing anomalies.  
Yes you can, but the impedances of the equipment might not match, causing anomalies
There is no impedance match problem with today's solid state sources, but there "can" be with boutique "tube output sources".

Cheers George