my suspicious nature

I get several phone calls or letters each year from my supplemental insurance provider insisting that I need a House Call.  They want to send someone to my home to check up on me.  It is supposedly a benefit of my plan, "a health and wellness program." So far I have resisted their efforts.  This is where my suspicious nature comes in.  I can't help wondering what they're trying to sell me. Just received another letter from them today and this time they've upped the anti. If I allow someone to come "visit" me I will receive a $15 gift card for Walmart.  Humm, I may have to give this some thought. Maybe if I wait six months they'll up it to $30?