Medicare Advantage Plans Must Be Very Profitable

Because 65 is coming up quickly (when most people become eligible for Medicare), I am getting 3-5 calls a day from East Indian spammers trying to sell their Medicare Advantage plan.  Because I retired on disability, I am already on Medicare.   I am very happy with my Medicare Advantage plan from Blue Cross.  The amount of calls says that there must be enough money to getting sign-ups to hire these telemarketers.   Or is this just an attempt at identity theft?