Advertising on web sites is a valuable, effective low cost tool - for two main reasons.
Firstly, if you already have a website - promoting it from a good ranking site adds power to your own site and helps improve its ranking with the search engines and places it higher in search results over time. The more links you have pointing to your website the more powerful it will be. You also have the added power of the Town site for search engine prominence.
Secondly, if you don't have a web presence and your budget is small, you can have a web ad (landing page) that will still allow you to promote your business with all the relevant details, photographs, email and phone contact details. You again have the added power of the Town site behind you for prominence in the search engines.
Web Ads have the added power of the Town sites for search engine position and ranking.