Sticky is the quality of two things liking each other so much so that they can attach to each other like glue. There are degrees of stickiness so that things can be separated ranging from needing a crowbar or A-Bomb to just giving a dirty look.
Spiders use stickiness in their webs to trap insects for food as do cannibal milk cows that trap humans with cold hands in their gigantic webs. Some seeds use stickiness to attach themselves to you so they can establish themselves in your warm, moist buttcrack to grow into a large tree. Velcro is sticky so that you will ruin sweaters with it and have to buy more.
So why would anyone purposely buy sticky notes? It sounds like an accident waiting to happen.