I've said it a while now. Any release that is low LE, continuous, and a variety of characters that my cross several genre's will do well. PTD's, BT's, Marquees from DSF. PTN's from Paris. Sorcerer Hats & Characters with hats from WDI (among others like ID Badges, trash cans, etc.) They always do the best. Someone gets one or two or three and wants to start doing them.
What sets PTD's above the rest is they are, and _almost_ always have been the one thing you could get at DSF no matter what. If you show up and miss on the released pins, you could bank on a PTD. Save the few times they ran out. So everyone can get one, they are low LE, tons of random characters, lately they have been in themed sets somewhat...BATB, Lion King, Aladdin, Tangled, Muppets, etc. So pick what you like or do them all. Plus you get ice cream and you are pretty much guaranteed to make a profit pin or dollar wise on your investment.
I think another thing making them nuts is too many people are inviting friends/family to the new raffle releases at DSF. They want to up their odds. So a ton of locals and people living closer than many of the veteran crowd, are now in tuned to PTDs. DSF is still running through their old order of DSF stamped PTD pins that are LE300. I HOPE they start making minimum LE500's and even higher eventually. The demand has tripled while supply has actually decreased now that it is one per person. Eventhought the edition sizes are the same, I think fewer are up for trade/sale than ever before because how many are collecting and keeping. I think all these new DSF people shot themselves in the foot by inviting tons and tons of their friends/families/etc. Maybe better odds at raffle releases, but they always end up wanting to start collecting themselves. Which helps the hobby grow but also makes the pins harder to get.
Seems the new crowd only deals in PTD's though. Or PTD's and older Grails. There is nothing in between for them. It's a PTD, or a $100+ pin or it doesn't matter to them. Also, they don't know how to trade for traders. They instantly write you off if you don't have a PTD they need. Even if you are offering them a PTD that is comparable or higher value and you need one of theirs. It's like pulling teeth from a 100 new baby sharks. They always want an older PTD than they are giving and always want the upper hand. And forget offering other older stuff. Many are not, I'll say educated, on the value of other/older pins. They know PTD's and DSF the last year or so and that's it. I picture them all being Darla's saying "I'm a pa-ra-nha." Haha.