I got into a bit of hot water a while ago about this issue. (Just another day in life of take8easy on PERB).
I would like to think I am the one who is making her drip gobs of wetness but sadly, the wet stuff has a bit of chemical taste to it. It also lacks that stringy-ness and that slightly colored texture to it. Lubes kind of feel and look like hand sanitizers. They are also usually water based so they also kind of disappear a bit quicker.
A few years ago, In one of my reviews of a very very beautiful and awesome girl, I wrote that she was heavily prelubed. She of course had said, "look baby, how wet you made me!" I swear that fluid was dripping down to my wrist, and it feels different on your tongue and fingers. Unfortunately, I was naive enough to mention that in my otherwise very positive review and ......... anyways. You lick and learn. Oops, I meant live and learn. So, yes, imho, usually they are pre-lubed.
And now, I am going to go and put on a bullet proof vest and a helmet on.