someone said that having a VASI bring you down 1000' down the runway that half of the airport would be used up. VASI's wouldn't be aimed that way.
Can you imagine flying your approach so that you can touchdown on the numbers...now imagine following a large or heavy plane (can you say wake turbulence?)
I think that was me, an airfield like that would probably Not HAVE any VASIs, but someone taught with them will still often land that far down! Not hard to teach though that if you normally land nearer the numbers you land past the touchdown point following a Heavy.