Pligg is for sale
Pligg.com is for sale at Sedo. According to this thread, there has already been a bid of 25K. Unfortunately, not enough similar sites have sold for me to estimate the value of Pligg based on historical data. But, I would guess it will go for around 40-50K because it is undermonetized. The new owner could release some premium modules/features and charge for installation while keeping most of the site free, and that could make some good money.