IMC, this tactic doesn't work because scry doesn't give enough info for clear teleportation. I don't consider this a house-rule so much as a clarification of existing rules.
From the SRD:
and
So IMC, scrying can give you information on the target (what he's doing, saying, etc.), but not so much on where he is. In other words, you have a clear view of the target but not necessarily what's around him. Now I don't think it's unreasonable that many people interpret Scrying as giving enough info to teleport, but I think that mine is just as valid, given the spell descriptions.
From the SRD:
Teleport:
The character must have some clear idea of the location and layoutt of the destination. The character can’t simply teleport to the warlord’s tent if the character don’t know where that tent is, what it looks like, or what’s in it. The clearer the character's mental image, the more likely the teleportation works. Areas of strong physical or magical energies may make teleportation more hazardous or even impossible.
and
Scrying:
The character can see and hear a creature, who may be at any distance... This spell creates a magical sensor located near the subject.
So IMC, scrying can give you information on the target (what he's doing, saying, etc.), but not so much on where he is. In other words, you have a clear view of the target but not necessarily what's around him. Now I don't think it's unreasonable that many people interpret Scrying as giving enough info to teleport, but I think that mine is just as valid, given the spell descriptions.