This is the best explanation I have heard. Go girl!!She started off well with the rich people having hedges around their house going to the market, but then it kind of fell apart from there.
At the market they bought some hedge trimmers to keep the hedges short, but a bunch of kids in the neighborhood keep putting fertilizer on them and the hedges keep growing. The rich people have to keep going back to the market to buy more expensive trimmers
… it might work better if it were the neighbors hedges that the rich people promised to keep short for a low cost (hoping that the hedges will die). But because the kids keep fertilizing, the RP have to keep trimming - costing them more, while the neighbor just pays the same low rate …
Maybe some SNL writer can polish that up 
… actually, isn’t that kind of like a seasonal contract for snow plowing. If it snows a lot, the company is on the short end of the stick. If it hardly snows the company makes out, and the customer just paid for nothing.