Because it's the best building on the highstreet, the first one you see when approach the highstreet whether it be from the station or by car, cycle or on foot from One Tree Hill. From what it sounds like, the majority of us here would prefer it be an establishment that befits the quality of the building and sets the scene for what could potentially be a great highstreet.
There has been comments on here with regards to prime location of shops and the dry cleaners in Forest Hill is a great example, it sets the scene of an area and look what one of the latest shops there was, that bright yellow shop selling cheap tat. This is THE prime location of Honor Oak Highstreet and the building and location deserves better than a Domino Pizza ...or a bright yellow shop selling cheap tat somewhere else on the high street which no doubt a chain like Domino's would attract
Snobbish maybe, but a Domino Pizza is not my preferred choice for that building. Look at it, it's crying out to be a proper pub!!