Yes they are ripping you and everyone and all the parking providers have received some sort of slap from google to make sure you don't get anything (basically).
I had same issue and their response was that you received clicks *but* price of each click is a fraction of a cent. I have no idea where parking is headed but it shouldn't have the reputation that it does have. It's going the way of basically if you park the domain, it will ruin the domain.
Seriously parking is dead, reselling a domain is alive because of it, you should keep a domain name to develop it then *earn* what you deserve much alike buying a share in a company and earning a dividend. With unwanted domains which you own, park them at above.com and join any parking company you are able to join. That is the max you can do. (if there might be trademark issues don't even park them and place a for sale page like efty.com)
Seriously this forum has gained many more users/members but the questions all remain the same or similar... Is parking dead? is parking worth it? what companies out there will make me anything ($) by spending nothing and that my domain name looks like I have put my domain to good use (free of charge and make themselves profits through commissions or something)
There will hopefully come out a good company (or companies) that might take on google (who hate domains that aren't developed) and say well here is a domain owner, a property owner, that provide different software options to place a website on the domain which functions and allows/gives the site visitor answers or products with unique content, becoming a band aid solution until you are ready to fully develop the domain name.
Until then wait wait wait, and in the mean time manage your money well to hold on to your assets, and spend some time to try and develop the domain name.
Each development is different and there is no way to give you an A to Z step by step as each niche, whether a travel website, an adult affiliate site, a finance banking blog or a gaming forum but these niches all have info out there how to make them professional looking functional profitable websites and that's what you should strive to do, otherwise just hold on and sell them on to someone who will do that.
I hope something I have said helps,
Your fellow friendly domainer that wants to better the online domaining community and world