Not quite digital marketing, but similar rules surely apply to creating well selling online web pages. The NY Times has a piece on how restaurants are trying to improving their menues. Things like highlighting the most profitable items on the menue via putting boxes around them, display prices without a dollar sign, etc. Some restaurants seem to be continously testing how to best design menues so that revenue and profitability increases.
“If admen had souls, many would probably trade them for an opportunity every restaurateur already has: the ability to place an advertisement in every customer’s hand before they part with their money.”
Very true. An inspiring read: Using menue psychology to entice diners.