It seems to me that if you send out an early probe (say, before your first pylon) you could steal both of your opponent's gas geysers before they would usually get one. You would have to delay your gateway until about 14 supply. But this should allow you to get warp gate much earlier than your opponent, as well as gas units like stalkers when it would be difficult for your opponent to get sentries to FF your units. This seems even more potent since in PvP, the mantra appears to be "Expand first, lose first"
So, the question is, is this a viable strategy? You could transition from this into a 3-gate-robo, or even into a 4-gate. Yet I have never seen this strategy used at a pro level of play. Is there any reason why this build order is bad? Additionally, what is the best way to counter a double gas steal, if, in fact, there is a very easy counter?