it depends on the chat you are on...if the people viewing the chat find you interesting you may get some quick traffic to your site.
In some chat forums you can openly let people know how you can help them or solve a problem they are facing.
solve a problem and make a sale.
example...someone comments about severe acne problems and you have a site that sells a quality solution for acne and skin problems...you refer them to the site and you have a good chance to sell some products and really help someone in need.
this way you both win.
so my answer to your question is YES!