You are correct - different buyers will value the business differently based upon their intentions for it. Some would be more interested in growing the SaaS side, so far all of the offers I've received are related to this, whereas others might be more interested in growing the AdSense & affiliate revenue.
Important to note, my business provides a service which will always be in demand no matter if real estate is booming or busting.
I think if I could get a 5x sale price I would take it. Best so far has been 4x and none have been below 3x.