Few things that you have to consider when making that assessment.
Joker: Hit it's stand alone climax until you start seeing the the Batman & Harley Quinn PF release. More so Batman than Harley Quinn, but don't underestimate the power the HQ PF will have on the Joker PF. It all matters, but really I don't keep up with any thing dealing with DC. I'm sure it's going to spike again when Batman is released. Lets not forget the Batman PF and all its delays.
Skaar Ex.: It's commanding $600-$675 as a stand alone mid B lister character still. I think that's pretty good if you ask me. Now when G. Hulk comes out the demand will spike again for all those that will want to have the father & son display. Just like before the Spider Trilogy was complete. The Venom CQ was commanding a solid mid to high $500, and on few occasion you'd see it hit the $600 range. Then when the Spidey hit. It was all she wrote. Now you can't seem to get a Venom CQ EX for anything less than mid to high $800's and it's pretty much held that spot for a good while now.
Deadpool Ex.: I think DP is in more demand than and arguably a little more popular than Venom at this moment in time. Hench the much larger ES on him opposed to Venom. Plus the DP PF shows that the hobby has had a mini explosion in growth. Then you start to factor in the sculpt, paint and yes even the little heftiness to him, and you have something on your hands down the road. After you factor in all the other things I said previously. Watch out! Considering he's already demanding mid to high $500's. This piece is not cooling off to the point where you'll be able to find him regularly under or at low $500's six months from now. As the time passes and most of these find their steady home a year from now. Watch what's gonna happen.
Been doing this a long time young whippa snappa...
You'll thank me later.