Does anybody here know what the profit margins of electronics are? I have been running onlineshops before (not electronics though) and we happily spent all of

Does anybody here know what the profit margins of electronics are? I have been running onlineshops before (not electronics though) and we happily spent all of the profit margins of an order on trackable advertising. Because a) the lifetime value of the customer b) the word of mouth value of a customer and c) the untracked sales generated by the advertising. 2.5% of revenue sounds unbelievably cheap to generate an actual trackable order.