A common house spider gets in my domicile by the usual trick (wedging himself into the door, then dropping into the house when I open it and running like heck). He runs right into the VFT pot, with me in chase--the spider can see my hand, and is trying to escape.
He runs near a trap--stops dead (!), climbs up on it, and starts eating nectar/dew off the edge. I stop, to see what happens. After a minute or two, he continues to look for a dark place to hide--no food tonight, flytrap! I catch him and eject him from the house.
I knew spiders drank water--but this one seemed excited by the sugar content of the dew. I think the theory that spiders are attracted by the insect corpses in the traps is dead wrong--I think the spiders like the dew. This one was willing to risk capture in order to stop for a taste.