Rather than boggling my brain with database stats, as a beginner I turn to my beginner's book. He certainly doesn't say that the advance variation is only for GMs. He say:
Exchange variation: "sleep inducing"
Winawar: "extremely messy"
Tarrasch: "gives black options"
Advance variation: generally gives one option, white attack on the kingside, and try to frustrate black's queenside counter attack.
So I reckon Yigor could be right, the advance variation generally "forces" the "one option", so play that!
Optimissed has formally proven that he's a pedantic guy always walking with the thickest edition of Thesaurus containing only CORRECT meanings!