Having purchased something on-line why do companies think you are going to give them any return business if they send out "marketing" emails every day? Once this starts happening with me its quite easy to set my email filters to routes them all to the junk folder where they reside for a short time unread before being deleted. The flood of unwanted emails actually does the reverse of what the company may think they are doing.
In some cases the marketing is for similar items that a normal household would only purchase once in every decade!