I'm generally in agreement with the sentiment here, but there is an asterisk. My $384.95 Lionsteel TiSpine will hold an edge longer than a Rat 1, and is more corrosion resistant.
BUT...
It will not hold an edge longer or resist corrosion any better than a Spyderco Native 5 in CPM S35VN (about $89, I think), and I consider it fair to say that a Delica or Endura in VG-10 is a good enough balance of edge retention and ease of maintenance to be called comparable from a performance standpoint.
I feel that there is a sweet spot for performance in the $65 to $250 range, where you can get anything from VG-10 to M390, which are the same level of steels used in many blades far above that price range. I'm also a big enough fan of S35VN that I'd say you don't need to go over $100 to get pretty optimal EDC performance.
Stepping back to the start, I freely admit that a Rat 1 is inexpensive enough and easy enough to maintain that it isn't strictly necessary to go over $40. In my opinion, the Rat 1 is King of Beasts in that range, and is to that price point as a Sebenza is to its own.