I have somewhere between 2500 and 3000 blades.
One thing i've learned is that most people stock up on blades, because at some point they either get discontinued, the quality gets worse, they become more expensive or harder to find. So if you find a brand that you really like using in your go to razors and find a good deal for a few hundreds of them, i'd say stock up while you can. Polsilver SI blades were dirt cheap 3-4 years ago and most people didn't care too much about them, but once they got discontinued and are now sold as Wizamet to the Arab countries, lots of people want to get them but now they cost way more and although I really like them as well as Feather blades, i'd much rather get Nacet or Bics Chrome Platinum instead.
Bingo. I started de shaving in December 2006. My main blade has been discontinued or changed at least 5 times.