My son has a site that enjoys 250k + unique visitors per month. Unfortunately the niche is very low paying and difficult to monetize. This is due to a very low level of commercial interest.
If he added a category that was commercially viable, would the pre-set EPC for the rest of the site keep click prices low?
If the answer is yes - would setting up this new category on a subdomain help, or would it still have the EPC linked to the actual domain?