I’m guessing you have not watched all of them as there have been quite a few that have had them.
A lot of it depends on what time you get in. Sometimes you have to layer into the trade although that is no ideal. The further it is to expiration and the earlier you get in the more premium should be there.
Sometimes IV is lower overall and that will make it more difficult to get the premium. Nadex does not price the binaries or spreads. The markets do trader like you and I, market makers, and Implied volatility in general. If IV is low then the premium will be less. This does not mean its bad it just means you have to adjust your thinking on how to have a potential trade.
If the premium is not there then there is either A no trade - or be if its cheap enough to pull of a straddle within the expected move (ie 35 pisp would mean that is far as we expect it to move then one could consider a straddle - though i rarely do them unless i state to do them as that means we expect the move to be < 35 pips if we say minimum profit of 35 pips). I want to tell you though that I will not list potential straddles on these with specifics as it is completely case by case basis and they have a LOT lower probability of being profitable as we Don’t expect them to move that far most of the time and that is the point of the condor.
The news plan is not just for placing news trades its for knowing what to expect from the news on specific instruments.
Also its there to get you to think outside of the box. You may be able to profit by placing the trade. You may on other systems use it to tighten stops, avoid a bad entry as the expected move has happened, or look for a reversal on another system with the added confirmation of the expected move happening off the event.
There is a lot of ways to use the news plan besides just the basic expectations and potential plays if the premium is there.