good but not that good

Just saw this in an ad for a web job that has me puzzled:

You must be: 100% Available IMMEDIATELY, have NO other pending projects and be able to give this project your undivided attention.

So in other words, they’d like a web designer who’s good but not so good that he’s, you know, employed.

The ad was sprinkled liberally with ALL CAPS so they’re VERY SERIOUS.