The pumps update on the fly. It's less likely they are scamming you and more likely you're not looking at the pump before you start. The pumps update on the price on the fly and are usually well ahead of the big sign. If the prices change while you're there, it's easily possible that you paid a different price than someone else.
They don't bait you with a lower price on the sign and then sucker you with a higher price at the pump. It can work the other way too; the sign can be higher than the pumps.
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Life is what happens while you're making other plans. 
2004 Dodge SRT-4 Silver - Bone stock
1983 Ford F100 step side - Ford 460 7.6L 
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