It used to be that guilds in general were good for instilling a sense of unity within the playerbase. They had the tendency to divide and isolate people a little, but that was ok. With guild houses, people were completely isolated when within a guild house. This was ok when there were lots of active players. Once the population dwindled, the isolation of players made the game look vacant. This was very bad for the game. It meant that new players would come on, see that nobody where there and leave.
I would really ask anyone who's considering buying a guild house to ask them selves, aside from having an amenity, what purpose will the guild house have, and what impact will it have on the game and the community.
I was never a fan of guild house RP. From my POV, the house isn't what made RP fun, but rather it was the unique ideas that various players brought into the game. Personalities, situations, conflicts, friendships, alliances, lies, theft, backstabbing, betrayal, trade, yadda yadda...