Re: Bonkers? oh yes.
If you're that serious an audiophile, you'll already have digital everything from the CD ROM to the amplifier. Any DAC will be inside whatever expensive amplifier you have, with nowt but raw digital data being sent via SPDIF, digital coax, fibre, or whatever digital output is on the back of your PC. This is without going into skip and jitter prevention technology like, say, a buffer.
The days of analogue audio cables running from the back of the CD ROM to your sound card through the copious RF noise inside your PC ended some 10 years ago.