One thing I've noticed is that I can get more shaves out of blades that aren't as sharp to begin with. My favorite blade is Red Personna. Now they are not as sharp as a Feather or some others but to me the edge lasts a couple more shaves before it gets harsh and starts nicking my face. Feathers give me a great shave for about one shave and then it's nick city. I do have sensitive skin so YMMV.

For those that take blades out to dry and/or oil, more power to you. But I feel that extra handling of the blade is just risking damage to the edge which is very fragile. One little ding on the edge and you have defeated the purpose of trying to extend the life. I shake water out the razor to dry it but I keep the blade in the razor for 3-4 shaves and then it lands in the blade bank. I am also very careful when removing a new blade from the package making sure I don't drag the edge on the paper.

I am currently using the Astra blades because I couldn't pass up the deal on Amazon for a pack of 100. But I only get about 3 shaves out of them. I can get 5-6 out of Personna.

Hope this helps.