I think it's an interesting to note that site visitors are seemingly understanding our product's value and utility better than before. I see it as 1 out of 21 people "got it" enough to win their vote, and by the 3rd go, 1 out of 7 people "got it" :)
You can't really conclude that from this - you submitted three different products at three different times to three different groups of PH users.
There's data you can use to measure the effectiveness and strength of your company - conversion rates to users and customers, revenue etc. Are you monitoring stuff like that?
You might enjoy this post by Dave McClure:
http://500hats.typepad.com/500blogs/2007/06/internet-market....