I'm starting to have real trust issues with this company in terms of its surge pricing.
Case in point, three of us on a quiet weeknight in Brisbane CBD around 10 PM standing next to each other, all take out the Uber app to get respective rides home. I'm first to request the uberX, but mine pops up with surge pricing at 1.4x. The other two whom seconds later request the same uberX and use the app far less frequently get no surge pricing. I reject offer, close app and retry 30 seconds later and mysteriously now no surge pricing.
In the past I have accepted surge pricing, so I'm sure they have 'learned' that I'm more likely to accept such fair hikes.
I'd be very surprised if these guys are not using various analytical information such as home postcode, past purchases etc to construct this surge pricing ratio.
Whether correct or not, a driver has told me you may have 3 available cars in a neighbouring suburb, but none in the immediate, you are likely in this scenario to be charged surge pricing. He mentioned also if possible to always wait until cars appear in the vicinity before requesting.
The question then is whether the little GPS map is actually accurate.
It would be interesting to run some experiments and see what they are up to.
It is plausible that the surge ended just after your quote. It has to end at some point.
Your case would only be valid if you had seen a surge quote between your 2 friends who did not receive a surge quotation.
Alternatively, they are likely to have more than a simple (are we busy) when calculating surges.