Too dull to shave with?

[grepper]

It seems like whiskers are so soft compared to disposable steel blades that there are hardly any steel atoms disturbed at all.

Also seems straight razor steel is just hard enough to maintain an edge through a shave, but also soft enough to re-align the edge on something slightly tougher than whiskers.

That makes perfect sense to me.  I mean, rubbing stainless steel against skin and cutting whiskers does not seem like that demanding a chore.  That said, cheapo disposable razors do indeed get dull.  Looking at the images of the blade I declared as too dull to shave with there was obvious corrosion and crud on the edges.  I don’t know if the dullness was due to rolling, corrosion or crud buildup, but its useful life had passed.
 
While he did not say it, I happen to know that the numbers Mr. Mike posted, ~50, were measurements of new unused blades.  The thing that amazing me was that the blades that I declared too dull to shave with were still pretty sharp, 65, 75, 75, only 15 to 25 duller than new unused disposable blades. 
 
15 to 25 is a pretty narrow range of sharpness between usable and too dull to shave with.  Obviously one test is very shaky ground from which to form any assumptions, but in this case a 15 to 25 reduction of sharpness was the difference between a useful razor and additional plastic in the landfill. 

For you straight users, what is the sharpness when they are good shavers and need attention?  Do they compare to disposables?