It's hard to argue with what works. Mono Black Control (MBC) decks usually aren't very fun to play against. They destroy your hand, destroy your creatures, and leave you with nothing but drawing your card and saying "go."
The only way I can justify this deck on a casual mtg blog, is to put the emphasis on putting as many swamps into play as possible. Also, as far as initial deck conception is concerned, it started off as a deck where I tried to cram every restricted black card into the deck as possible. (Every card but Entomb and Imperial Seal is in the deck.)
And slowly but surely, it morphed into just another MBC deck.
Like I said...
It's hard to argue with what works.
[Decklist] Restricted Mono Black Control
4 Korlash, Heir to Blackblade
4 Sakura-Tribe Elder
4 Dark Ritual
4 Hymn to Tourach
4 Chainer's Edict
1 Lotus Petal
1 Demonic Consultation
1 Vampiric Tutor
1 Demonic Tutor
1 Yawgmoth's Will
1 Yawgmoth's Bargain
4 Cabal Coffers
4 Overgrown Tomb
There's not much to say as far as how the deck is played. I think it's pretty straight forward.
If you get a couple Tribe Elders and Korlashs out early, the Corrupts get really ridiculous, and they really are your main kill condition. Sure there are 8 creatures in the deck, and you might even kill someone with a Korlash every once in a while, but for all intents and purposes, it's a creature-less deck.
It's important to note that with the inclusion of Demonic Consultation, every card in the deck is either restricted or has 4 copies.