Heck no, I advise everyone to pay online as long as they are using the correct link/sites. I firmly believe electronic is far more secure than snail mail, but you cannot convince conspiracy theorists and old school people of it. I ditch those clients quickly. One of my first questions for a prospective client is "just how tech savvy are you, and do you hesitate to pay invoices electronically?" If they say "not very, and yes" then I do not accept them.