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I actually read the article or post before I upvote. But usually I follow and upvote people that follow and upvote me.

@wvm it's all depend.
Some high profiles, have been caught doing plagiarism.
Some are safe to upvote. I don't upvote those with too much monies already.
Mainly, look after the Newbies.

Well I'm new. ;)

@bullionstackers just started following you, checked your page out and looks like posts I'd read.

It's really hard to say that without accessibility to the metrics of our individual posts. All I can assume is that people who comment + around 30% of the voters might read it. This is again just a guesstimate. But for the daily trending authors it might be more or less.

Just compare the number of Views with the Votes for this post ;)

That was a real eye-opener, 102 votes, 50 reads and 24 replies (25 with this one...😀)!

Some people do read. Most don't it seems.

I do most of my voting on AutoSteem so the majority of my views don't show up in Steemit.com. For the most part I curate art & photgraphy and target posts with a low amount of votes. I think about two thirds of my votes are automated (30 to 40 per day).

I also have a fair number of automated votes :)

I'm gonna be 100% honest here, I also upvotes articles without reading. Most of the time if I do I've been following the author for quite a while already so it's also a kind of loyalty thing for me. Lets say 35%/50% of my feed gets upvoted with out reading properly. I know it sounds weird, but I think that a lot of people do this but won't admit it.