ph34r my l33t skillz, says the advertiser

Brandon at Texturl collected a whole pile of recruitment ads that speak the target markets language, some found here and wonders:

So my question is this: When will this type of recruitment ad become so popular it backfires? When will the target audience (smart cookies, all) see these sorts of ads as simply attempts by corporate entities to “speak geek”? When will L33T become lame?