(This does not apply to advertisers).
Here's a tip: If you're a regular reader of Ancient Digger, if I read your site, and you often comment, most likely I will make exceptions for linking. If you ask to exchange links with me and you're doing is just for backlinks, I will not link to you.
Note: Please do not feel offended if I don't link back to your site right away. I have to maintain the site in a certain way, especially considering I am featured on high profile history and archaeology websites.