Are higher end preamps worth the investment when you are only streaming Tidal & Spotify ?

I'm not sure you need to spend $10K. In my opinion the AT7 QS Line Stage gives me definite improvement for my PSAudio DSD. I would never be without it streaming of otherwise.

@oddiofyl 

"I upgraded to an Aurender N200 to pair with my DAC and feel it was a worth while choice despite it's price tag.  I don't even play CDs anymore "

Whats this....C..D... thing you speak of?

And let me add some of my findings concerning, at least  PSAudio's built in streamer. Everything sounds better with the Bridge ripped out.

I use Audirvana on a mac mini and USB that into the DSD with a nice cable. I stream from Qobuz. Once I find an album I would hate missing as in when Qobuz removes it, I search for the highest rez I can find and purchase it.

My only point is that the pre is just part of the chain and anything is only as strong as its weakest link.

BTW they are selling factory checked DSD on PSAudio's site for $3K.