If you want to visit all of the photo spots ("fuzzy pickles!"), you must buy this luxurious villa. The trigger point is about in front of the couch.
Otherwise, there's no mechanical point in buying this house and you'd do better to only bite the bullet once you're ready to start looking at your album. Nudge nudge, wink wink.
At that point, you should have cash aplenty (I had $446,901) and very little to spend it on.