This is especially true if the coupon advertising is utilized within a weekly or monthly coupon advertising newsletter which is mass emailed to subscribers. These subscribers may never have heard of the seller who is offering the discount coupon so their only contact with that seller is through this monthly mass emailed newsletter. If the recipient of the newsletter is interested in what the seller is offering with that discount coupon they will follow the link to that seller's website in addition to saving that coupon code so they can use it when purchasing that product. If the coupon is for a general discount for that specific seller you may find you have increased your online sales when that buyer uses that coupon for more than one item.
Advertising with coupons for online sales is no different than have a mass mailer go out in the mail except it doesn't waste natural resources because there is no paper wasted because that coupon does not need to be printed out. It only requires the prospective buyer note down or save the coupon code to a file so they can type in that coupon code when they have completed updating their basket before they complete final checkout. Since this type of advertising is for online stores only it is one way to get more people to visit an online retailer website. Then once the buyer has made a purchase on that website the online retailer can offer a repeat buyer customer appreciation coupon for their next purchase using a coupon code wither on the purchase confirmation or in a follow up order confirmation email.
This is what advertising is all about. It takes an initial purchase and rewards that buyer with a further discount for coming back to the website. This is more difficult to accomplish with a brick store front. It is far easier to make repeat visits to a website especially when so many consumers today spend a lot of time buying merchandise on internet retail websites. Even various consumer studies continue to show strong internet online sales growth.
One of the principles of advertising is that the sign be readily available for people to see. This holds true for an outdoor sign or for an internet sign bearing your advertising. If the browser can see it they may glance at it. If the position on a website page is a strong position then it will be in the line of sight of most people browsing the internet. This is what attracts attention whether on a sign post or on a cyberspace signpost on a website. So this type of advertising pays off for most online retail companies.