TW,

In your ad you direct viewers to your website. You give them 3 ways to pay. Only two choose to mail you their payment, while the rest pay online.

No mystery. You gave your customers what they wanted. CHOICES!!!

Those two chose snail mail, for whatever reason, but everyone else wanted to "BUY NOW", avoid looking for an envelope, then hunting down stamps, "Oh...uhh... what is the going rate for stamps these days?" "Ah forget this I'll just pay online."

The mystery for me, "Why would anyone want to mail a check through the mail?"