Ah yes, this old chestnut. I promise you it probably won’t and I’m not even trying to sell you anything!
There are some good salespeople out there, but they’re a rarity. Sales staff are generally paid a commission on each item they sell. This isn’t always the case but where it is, you’ll see that this creates a horrendous conflict of interest. They need you to sell you new equipment and the store needs the turnover. In almost all cases, older turntables are better than cheap new ones. You’ve been advised!