Who the hell still pays that? I mean, if you for some reason decide not to use a MasterCard/Visa capable debit card and if you leave the $1.50 charge on your card for several months, then maybe you'd have to pay interest or processing fees... you'd have to be pretty dumb to let that happen, though. :)
"Found the company’s product docs. “Bright, flashing blue LEDs to attract customers.”"
Of course there are flashing lights to attract customers. Basic common sense - small rows of blinking LEDs that make weird wave-patterns and stuff draw the eye. You'd be a liar if you claimed blinking LEDs didn't draw your attention. ;)