Online advertising is essential to creating positive flow to the online site. Utilizing sites such as Google Adwords allows businesses to make their site known to the public and increase the amount of visitors to their site. This increases awareness and therefore increases revenue.
Advertising through such means as Google Adwords use what is called keywords. Keywords are main words that, when inputed into a search engine such as Google, bring the person searching to site pages where the advertisements would be located. When those keywords are entered people are automatically sent to sites where they wish to be and are shown advertisements that match up with those keywords. ie keywords such as Scrapbooking bring up search listings on scrapbooking and advertising for sites such as www.makingmemorieswithwscrapbooking.com
An online presence is integral to all businesses, no matter what business they have. By advertising online it increases awareness of the business and therefore increases flow to their website. As 99% of businesses are online these days it makes sense for a business to want to get as much flow to their site as possible. Online advertising allows that to happen. So really, you should.