Suppose, as an example, I have a website with the address, www.cool-gifts.com and I'm getting regular sales and its a worthwhile site, but no great fireworks.  After research I find that there is a great market for '2nd hand stuff' and I'd like to serve that market.  Would it be best to add '2nd hand stuff' as an additional category of gifts in my existing site....or, since the 2nd hand stuff is a market in itself, would I be better off investing time and energy bringing up a whole new site (www.used-stuff.com)?If I had employees and financial resources, it probably would be a no-brainer...start a new site.  But, what if you are a small guy, with limited resources?So...new site....or add to existing site?
Do I create new site or add to existing site?
seo;ecommerce;marketing;ranking;business models
I think you could do both. Until something is set up, talk about it on your current website. This means the traffic going to your site will see your new website (in it's idea phase) and this will generate interest.Once the other site is up and running, then link, even advertise your new site on the existing site.It also sounds like the two websites would appeal to the same demographic, so doing this is a no-brainer (In my opinion anyway).