The vast majority of sales jobs exist to manipulate people into buying something they wouldn't have otherwise bought. That's the whole purpose of the job. Otherwise it's just a pointless bullshit job where what you do doesn't matter at all. Most people who work bullshit jobs come to hate them. They feel trapped because having a job where you get paid well for doing nothing is supposed to be the dream.

I think sales tends to make you a worse human being as well. The jobs tend to create a culture where lying and manipulation are not only permitted but praised. Your coworkers will celebrate screwing people over and you'll absorb their horrid justifications for what they do.