May I ask why do you expect an increase in revenue?
What above.com does is, it checks which parking service pays more and redirects the traffic there.
PC along with voodoo are the best earners so, comparing with domains you already have at PC or Voodoo, won't make any difference.
Above.com excels at
protecting you from getting low results.
Let me explain what I mean.
Let's say that service 'A' earns the best now and service 'B' earns lower.
Above.com will obviously direct almost all of the traffic to 'A' and leave a small percentage (let's say 1%) to check periodically at service 'B'.
Now, let's say that parking 'A' decide to up their share of the revenue so leaving you earning less.
Above.com will eventually catch up with that and direct the traffic to service 'B' which now is the best earner.
Above.com is not for small portfolios. It's for those times when you can't constantly check what happens with each parking service and each domain in your portfolio.
If you have a small portfolio that you can easily check yourself the earnings will be better than letting above.com handle that since the human eye is not based only in numbers but in common sense too.
sorry for the long text but it was impossible to explain without creating a wall of text in the process