The Gnawing Urge for New Armies

So I'm reading Rhellion's blog post in which he chronicles his Ogre Kingdoms opponent walking away from a game in the bottom of turn two because he didn't like how charge reactions work in 8th ed.  And then I started thinking about Ogres.  And thinking more about Ogres.  And starting Army Builder to see what an Ogre list could include in 2k.  And looking at GW's web site to see what an Ogre battalion includes....

You know what?  With a little conversion, you can have a 2k Ogre army for about $150 and a little conversion work.  I can't say I'm not tempted.... a unit of 6 Bulls in two ranks of 3 would get 22 S4 attacks with ironfist = 11 hits = about 7 wounds + 3 S5 impact hits + 3 S4 stomps = about 12 wounds on a typical T3 troop if you can get all 6 Bulls into combat (yeah, I know... good luck with that.)

The list:
Tyrant w/ Skullplucker, Armor of Destiny, Obsidian trinket, potion of speed, luck Gnoblar
Butcher w/ Talisman of Protection, 2 tooth Gnoblars
6 Bulls w/ Crusher, Bellower, Stardard Bearer, ironfist, light armor
6 Bulls w/ Crusher, Bellower, Stardard Bearer, ironfist, light armor
6 Ironguts w/ Gutlord, Bellower, Standard Bearer
20 Gnoblars w/ Groinbiter
24 Gnoblars w/ Groinbiter
4 Leadbelchers w/ Thunderfist, Bellower
4 Leadbelchers w/ Thunderfist, Bellower

It's basically two battalion boxes, with two of the Ironguts converted to be a Tyrant and a Butcher, and a couple Gnoblars nabbed to act in the luck/tooth capacity.  Is it optimal?  No.  Is it playable?  I'm sure it is.  Does it look like fun?  Yeah, actually it does.  The only thing I wonder about is how useful Gnoblars would be with their M4 stat.  Seriously, getting the big guys into combat (and away from shooting) seems like the best way to use their strengths, and Gnoblars as a screen would slow them down.

So now I have to wonder... why!!?!?  I already have my beloved Skaven (including a bunch of on-sprue ones from Island of Blood!) and my wolf riding goblin army, which consists of exactly ONE assembled and painted model (and about a dozen unassembled.)  So why am I toying with the idea of another army?  The rules?  The minis?  I really don't know.  I'm already jonesing for a Hordes Minions army, and I have a ton of Eldar to build and paint.  Why do I want Ogres now?!!?

What drives you?  How do you turn it off?!