If push traffic is untargeted it’s the same crap as pop traffic. If traffic is targeted, eg. They made a choice to subscribe at your site then you will see a better performance from the traffic on the site.
The CTR on display ads is about 1% no need to expect more, the only thing you can do is to increase quantity of paid ad impressions and your CPM/CPC rates.
Propeller ads is crappy ad network, the same as many other push networks, the only good push traffic you can get is the one that you will subscribe yourself.
The ads that are displayed on your site are out of your control but depend on the user browsing history, interests, and other data including his location and device. You have no control over what type of ad to show and you cannot show only most expensive ads.
The only thing you can do is to setup ad server and make ad networks compete for each ad impression letting the highest bid win.