What's a Good Way to Buy Music Collections?

Even if you bought the physical CDs of someone who has ripped his collection to a hard drive, that would still be a copyright violation.  The person buying the CD has a right to the use of the content on the CD, including ripping it to a hard drive for his own convenience.  But, when he sells the CD, he would have to delete the files associated with the sold CDs to be compliant.  It is simple--there was only one purchase of the right to the content, there cannot now be two different owners of the right to use the content unless there is a second purchase of the right from the holder of the copyright.

@jhnnrrs 

I have not heard the Onkyo

I would say reserve judgement until you try.

@kota1

If you believe this device brings MP3s to the sonic quality of DSD, then I have a bridge to sell you.  I'm sure it's a fine player, but its ad copy is a thin tissue of lies, exaggeration and puffery.  If anything, converting 44.1/16 to DSD is a LOSSY conversion, since you are converting between formats.

@jhnnrrs 

Denigrating  my experience isn't necessary, my hearing is perfect, I just tested it. 

I'm not going ten rounds in explaining what an FPGA DAC is, thanks.

Qobuz also has a download store where you can purchase music files.