I'm new to this and have seen a few comments in this forum saying that you don't want to buy a site that's overly reliant on search engines for traffic. I understand that's because algorithms change and that traffic can disappear overnight. What's a realistic ideal mix of traffic sources then? Aren't you worse off if the site relies more on advertising for traffic? Should a buyer just be looking for sites that have a lot of traffic coming in from referring sites? Any advice would be appreciated.