With all due respect, if someone has never been to a Wal-Mart....
And Wal-Mart is one of the biggest retailers in the USA.
That might be like someone who doesn't have a computer talking about Microsoft.
So since you don't own a recording studio you can't talk about the sound quality of CDs, right?
I think the saying would be:
If you don't listen to CDs or buy them, it would difficult to talk about Sony/Columbia Corp. (or any other dominate Music company)
Or:
If you don't own a recording studio, it might be hard to comment about a mixing board from the dominate manufacturer.
Or:
If you don't listen to music, it might be difficuft to talk about the sound quality of CDs or LPs.