Not really a total scam depending on your perspective but lawn additives. I’m not sure what the term is. Basically when they come out fertilizer out. I say not totally because some people really do want a super green, super short, and (in my opinion) super ugly lawn. I replaced my front lawn with clover and the bees love it. It was green literally until Christmas last year (2022) when we had the big frost (southeast US). Like, okay, it’s a little less green or whatever, but wow it was green that late in the season and everyone else’s was brown.