$500 USB cable


Someone is trying to sell some fancy (used and 2 ft long) USB cable for $497.50. I am genuinely curious since I am no expert. What does this ultra expensive USB cable do to your audio system (besides transferring digital data)?
jkbtn
I will chime to say that a fool and his money are soon parted and there are tons of audio snake oil salesmen out there.  By all means, try different USB cables to see if you perceive a difference, but make sure you get a 30-day money-back return deal when you buy them.  I have recently been on a foray to upgrade my IC's and PC with significant benefit to my system with gear from Silnote and Shunyata, but I have in the past auditioned both IC's and PC's with no benefit to my system so I sent them back.  USB connections are a different kettle of fish.  Almarg, who we can count on for solid advice, gives you the straight scoop above.  Cheers. 
I am with CZARIVEY on this ...if the ones and zeros can make it from one end of the cable to the other, there can be no difference in sound.
Who guarantees the 0 and 1 sent are correctly?
not the DAC receiving it.  I just had a scenario with a wireless signal to my laptop Tidal App (MQA) > coax > DAC was garbled.  The 0 and 1s where being sent otherwise no sound.  But the DAC  just took and played what it was sent.  

The dac is known to be very good with identifying the quality of the signal and sending to one of two filters for processing. But it just processed the bad signal. 

The USB cable didn't have anything to do with this problem, but that did make me realize the DAC doesn't know good from bad.

ill audition multiple $100,$200,$300 cables and make my mind up it it sounds better than the $24 one. There are many forums where people have positive results from  regens.w4sound, LPs to ignore.
" What does this ultra expensive USB cable do to your audio system "

It diminishes the sound quality ...

because it takes money out of your pocket that could have been spent on equipment that actually does make a difference, namely speakers.

Ones and zeros aren't that picky. They're either there are they aren't.
All signals are analog. The only difference is the information contained in the signal. In one case it’s an analog waveform, in the other a series of square waves representing voltage levels. So actually the so called digital signal doesn't contain ones and zeros, but representations of ones and zeros. Both types of signals are electromagnetic waves, I.e. Near Light Speed, I.e., photons.