it's pretty easy to pick up money from either inefficiencies or people wanting to play longshots. in an efficient market where only one of the listed outcomes can win the yes/no prices should sum to 100%. in some markets the YES sums to well over 120% because people want to back a side instead of betting something doesn't happen so you just buy NO's for every offering and lock in a profit. you can grab the
xml feed and sum up the BestBuyYesCost and BestSellYesCost to see which markets are most irrational (stuff sums to 110% or higher) and watch those and build up positions. it's pretty small stakes, high site fees, and long time frames so you gotta like political stuff or be bored. should be worth a few thousand each year and more in election years.
or just sell NO to people who want to buy yes on markets that meme well like indictments, impeachments, or andrew yang.
pro players get into the weeds and actually build models, study the news, and try to predict stuff but seems like too much work