Music Media.
First I purchased LP's and 45's. One hole.
Then I purchased cassette tapes. Two holes.
Then I purchased CD's. Back to one hole, but now it was digital, so there were lots of zeroes.
With digital files, you have lots of 1's and 0's, so "half-nothing."
"They say it's not" is a clue for "naught," or "0."
"While I was buying, I grew two more feet," literally, as I purchased my first record very young.
I'll be trying not to let the door hit me on the way out, now. I tried to delete the President Trump anagram, but couldn't. For those I have offended, I deeply apologize. I really enjoyed the riddling, and I think missing it will be the price I pay.