After adding all the sets on Reply #6 on up, I've found that this list has 13 sets of 5 and 15 sets of 6.
Between 5 and 6 seems to be the average number for most-parodied product sets at this time. Originally, it was between 4 and 5.
And, as mentioned above on Reply #21, both Wacky Packages and Cap'n Crunch are tied for the highest number of releases with 24 (although Bazooka, Tootsie Roll, Reese's, Planters, Kit Kat, Snickers, Pepsi-Cola, Butterfinger, Frosted Flakes, Dunkin', Kool-Aid, Hot Wheels, Play-Doh, Garbage Pail Kids, Raisin Bran, Crest, 3 Musketeers, Milky Way, Charms, Ring Pop, Pringles, LEGO and Mr. Clean are all slowly but surely catching up to it with 21, 14, 14, 14, 13, 13, 13, 12, 12, 12, 12, 12, 12, 11, 11, 11, 11, 10, 10, 10, 10, 10, 10, and 10, respectively). Also, as mentioned above on Reply #37, Gadzooka Bubble Gum is the most individually released Wacky of all with 28 (including one that was unreleased).
Always remember, though, that all of these figures are both subject and more likely than not to change at any time, of course.