They make it look like you're getting a lot more than you really are. It's a 'sneaky' trick.
It's a 'sneaky' way of getting people to buy something they don't need.
a 'sneaky', untrustworthy person
(..) Wait, so you- you live with our grandmother? How'd you find out about her? I can't believe she wrote you without telling me. It's so sneaky. Does it offend your strict moral code? So, how's it going for you down here? Who's buying your cocktails? No one. (..)2005 In Her Shoes