I think people miss the degree to which advertising copywriting is art.
No one should try writing copy who does not love words.
Some quotes from one of the great wordsmiths, Ernest Hemingway, are in order:

“All my life I’ve looked at words as though I were seeing them for the first time.”
“There is nothing to writing. All you do is sit down at a typewriter and bleed.”
“There is no rule on how to write. Sometimes it comes easily and perfectly; sometimes it’s like drilling rock and then blasting it out with charges.”
“Poor Faulkner. Does he really think big emotions come from big words? He thinks I don’t know the ten-dollar words. I know them all right. But there are older and simpler and better words, and those are the ones I use.”