Best Way to sell sites without revenue?

What is the best way to liquidate sites that have not produced revenue?

I have a bunch of sites that were intended for adsense, but have not spent much time on them. Most of them are exact match domains, with anywhere from 1300-9900 exact match searches. Many are ranking on the first page of google for their targeted keywords.

Most of them have not had any monetization whatsoever.

In evaluating my business, I have realized that I am spending too much time in too many different areas and need to eliminate distractions, hence the need to sell some of these sites to free up resources (mental and financial) for other areas of my business.

Part of the problem is that I have not had analytics installed, so cannot demonstrate traffic.

Is Flippa a good place to sell them when there hasn't been any revenue from them?

Best to sell in a batch or individually?

On average, what is a site that has 1500 exact match searches, $1 cpc sitting on page one of google typically worth?

I know that I can just add adsesnse to them and let them site for the next few months, but wanted to get some other perspectives.

Thanks for the input.

Chad