We lie all the time.
DD2 has only just her annual pass for the local theme park, she is 4.5 and has spent the last 1.5 years being carried in by dh - they don't ask if child is being carried/pushed. The kids have no idea - and that includes my 8yo dd1.
DD3 magically becomes under 2 so we can all share one family room in premier inn type places. The kids have no idea.
I lied about dd1's age on the bus for a 1.5 years. She never knew. I used to send her ahead to get a seat
.I was only ever asked once anyway. When the time comes I will lie about dd2 and dd3 as well.
I also do the clubcard Ebay thing.
Give me a way to get it cheaper and I'll do it. Love the thrill of getting a bit back from the thousands of companies that rip me off every day of the week with huge mark ups.
I couldn't care less what other people think. Good for you that you pay full price, the more people that pay full price, the better- it means they will be less suspicious and ask less questions of the rest of us. So you carry on looking down your nose at me and I will carry on not caring 
That said, I do have certain places, like Monkey World for example, which I would never rip off.