Does appraisal comp include the house's own historical price?

[Hanbin Y.]

Hello, I'm looking to buy my a property for primary home. Since I may relocate in 1-1.5 years, I'm considering an exit strategy as selling it in 1-1.5 years. Therefore, I want to give a lowball offer for more margin. But my agent said a low sale price now can affect the price when I sell it in 1-1.5 years. Instead, he proposed to offer with a higher price but let seller pay closing cost. What's your thoughts? Should I lowball or offer a higher price with seller-paid closing cost? Thanks!