Saw this post: a trader caught Marvin Harrison inactive and bought Cardinals receiver overs at 24.5¢ and 23¢, then sold for +114% and +98% after fees.
That’s a real edge on one book, but 24.5¢ was the best displayed price, not the best fill.
This is what I meant in my article: even on a single venue, the top of book is what you see, not what you get. Next levels, fees, and whether the print is still there when the order lands all matter.
You can still beat that venue’s own best price on the same market, with the same dollars, you can get more shares and avoid costs eating up your profits.
This is how people make money on Polymarket.
Cardinals made Marvin Harrison Jr. inactive.
We had it Oct 10, 15:02 UTC, from Adam Schefter: "he will be inactive for Sunday’s game vs Detroit"
We bought right away: +114% and +98% after fees.
Lions vs. Cardinals - Player Props, Kendrick Bourne: Receptions O/U 2.5
14:41 the price starts to move
15:02 we get the news and buy Over at 24.5¢
18:06 it tops out at 73.5¢
20:25 calm for 2 hours, we sell at 54.5¢
+114% after fees. We caught 63% of the whole move.
Lions vs. Cardinals - Player Props, Michael Wilson: Receptions O/U 6.5
15:02 we get the news and buy Over at 23¢
15:17 the market starts to move
15:26 it tops out at 50¢
17:27 calm for 2 hours, we sell at 47.5¢
+98% after fees. We caught 95% of the whole move.
Why: With a starting receiver out, the other Cardinals receivers should catch more passes.
How it works: an "Over" share pays $1 if Kendrick Bourne catches 3 or more passes against Detroit. Its price is the chance the market gives it: 24.5¢ means 24.5%.
Not financial advice. Just information.