Why did you buy those programming books sitting on your shelf? Because you wanted to learn to code so you could do X. (Probably get a job, get clients, make cool things, etc.) Copywriting is an effort to connect with the reader and tell them that the product matches up with what they need/want.

There is nothing wrong with marketing. Marketing is how honest people get paid for doing honest work. (Both Jim and Nathan are honest. I've exchanged email with them both.)