Sites like Trovit or any other site that doesn't list the seller's contact info are nothing but aggregator sites and should be avoided! They typically tease/deceive users with unreasonably low prices into completing a form with all their contact information to inquire about a vehicle "being offered." Generally, a little Google searching reveals they merely scraped the web for other people's ads and show them as their own, often presenting unrealistically low prices from early auction bids. Many of the cars/ads they show are long gone, expired, or sold long ago. I'm not sure if they are collecting users information to sell to marketers, trying to broker a referral fee if a car sells, or merely trying to drive traffic to their site in the hopes you'll click a revenue generating ad or link from their site.
Anyway, such sites are a total waste of bandwidth!