Hmm, it's been a while since I added those up but I may have just been strictly looking at trading cards, which would mean the series 1-3 titles wouldn't have counted because they weren't made in bio-card format like the S4-6 + Halloween. I may have only counted the bonus cards for S1-3.
I know, you are going yo ask me why did I then count the 6 titles in the Wacky Ad series if I didn't count the postcards. I'm not sure. If I get a chance tomorrow I'll go through my checklists and count again. It will give me an excuse to go through my binder books!
Leaving out the 9 titles from series 3 that were only in postcard size, I've got:
Mutty Bars
Grave Nuts
Clucky
Hoppy Meal
7-Pup
Ghostess Fright Pie
Bricks
Bots
Rex Mix
Dead & Buried
Molten Crisp
Bugweiser
9 to Life
Gaggin' Strips
Speed Lick
Wander
Stench Berries
Klepto
Taco Bill
Tombs'
H8
Philly's Runt
Captain Moron's
Lice
Alpha-Bytes
Maulboro
Killing Croc
That's 27. Plus, when I said 28 I was counting Croca-Cola, but since that was a promo, maybe you're not counting that one? I didn't count the Wander color rough bio card since it is the same 'title' as the final art bio card.
With the Halloween set, you show 8, but I count 7, unless you included the Mr. Ghoulbar color rough bio card - if you did, then the other count should go up by 1 for Wander. I wish they had managed to get Tootsie Troll in there as a trading card size, too.
I recall Neil saying that bio cards were probably going to stop, so I guess upcoming postcard sets may not seriously impact your count.