Are we talking about getting friends to help you for pizza or about a professional moving service? $20 seems cheap for movers but seems to be about the price for a couple pizzas.
Both numbers are for hiring people on Craigslist. $20 was in Rochester, MN and $50 was in Baltimore, MD.
Two of the main resources people have are time and money. The world offers many opportunities to trade one for the other, at widely varying rates.
I've often heard people recommend trading money for time in the abstract, but this advice is rarely accompanied by specific recommendations on how to do so.
How do you use money to buy time or otherwise make your life better/easier?
See also the flip-side of this post, "what are you surprised people pay for instead of doing themselves?"