A few rebuttals (for lack of a better word) on player psychographic profiles.
1) I think your description of Dark Depths + Vampire Hexmage (Curse the lack of an auto-card feature in these forums) is more of a Johnny/Spike combo . My definition of a Johnny Combo would be Mana Web + Painter's Servant + Isochron Scepter or Freed from the Real + Bloom Tender or March of the Machines + Mycosynth Lattice + Expertiment Kraj + (Insert Planeswalker Here).
(NB: The new rules make the latter combo be less awesome. The old rules allowed you to basically play all of the abilities since Experimental Kraj is not a planeswalker. However, the new rules link all the abilities to the object that has a planeswalker ability.)
2) There are other subsets of the Timmy personality type. One of these is the griefer Timmy, who takes pleasure in watching others suffer. A good example of this would be a deck filled with The Abyss + Grave Pact effects. One of my aims (which will never get realised now that Painter's Servant is now banned in Elder Dragon Highlander) was to get the lock of Painter's Servant + Enchanted Evening + Gloom. (This combination means that no one could ever activate abilities. Tapping a land for mana is an activated ability.)
3) The two missing player psychographic profiles are Vorthros and Melvin.
Vorthros, in short, enjoys the story behind Magic and the art. They look at the card and really enjoy the detail of the artwork and laugh at the flavour text of a card. They read all the Magic books and like to pretend they are actual planeswalkers doing battle against other people.
Melvin, in short, are the rules lawyers and like the interaction between cards. They smile when they try to think what happens with how the card interacts with others like, for example, Chandra Ablaze and Library of Leng. (Short answer: it's complicated)
It should also be noted that these two psychographic profiles are on a different axes to the Timmy-Johhny-Spike Profiles.
is an article about Wizards thinking on the matter. (It may be a bit old but it highlights their thinking and also links to a more in-depth discussion on Timmy-Johnny-Spike)
3a) As a corollary to this point, I think you'll find that Spikes will, quite often, argue about the Infraction Penalty Guide and the Tournament Rules more than they would argue about the rules found in the Comprehensive Rules. Melvins would definitely argue about minor points in the Comprehensive Rules.