the proof is in the pudding

[Performify]

From the FAQ:

# What is the highest sustainable win rate in point spread betting?
# Generally, somewhere in the 55%-60% range is considered the maximum that is sustainable. However, if you start approaching the higher end of that range, you are probably passing up some +EV wagers.



(emphasis added)



Not to say anything about sample size, yadda yadda.

No one says its "impossible" to pick 60%.