Probably because the iTunes position isn't "attractive" enough for radio to spin it hard but with the upcoming promo i'm sure radio will see that the song is worthy being played.
My mom found out Adam Lambert is doing a signing in NYC on the 18th and we'll be there Thurs and Friday so we're gonna see him that day to get albums signed and then see him live on Friday for the GMA summer concert. My mom is going crazy haha, I'm a bit excited too let me listen to his music more