Thanks to Mr. Treppenwitz who emails the answer to our reader's question.
In the Jewish record business, going 'Gold' means that the artist has:
a) convinced the seforim stores to take all his tapes and CDs on consignment
b) given all of the tapes and CDs to his friends and family as gifts
c) some combination of a & b
The actual quantity of albums being discussed here is equal to the number of
tapes and CDs he can fit in the trunk of his car!
Thanks for clearing that up for us!