Cycling tights; What does more money get you?

I'm looking for un-padded tights so that I can wear them for multiple rides and wear padded shorts underneath. I always thought that the money was in the pad, but it looks like padded / un-padded are the same price. There is a huge difference in price between low and high end tights. What do you get for the extra money?
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Keep their shape better when wearing and after washing?
Buy cheap, buy twice does still apply, in my experience. You just have to work out how often you will wear them and whether the extra money will be well spent.
Steve
The chamois is the highlight. Their airzone chamois is the best I've worn so far, it's very thin, but is a lot more comfortable than a lot other chamois. I ride a 90gram carbon saddle with no padding at all with those shorts/bibs, and I have no problem. It's worth the cost going for better clothing, for me, they lasted quite long as well.
Usually can be had about 1/3 the cost of an equivalent cycling specific pair of tights.
Under Armour brand pretty much.
Me? I hate tights for anything other than running. Bibs for me. And the thought of two layers (shorts and bibtights) rules out non padded tights for me too.
So, in relation to are more expensive worth it? Yes, because they last for ages. But, so do brands like Lusso and dhb. I've had some stray threads on one of the latter.
All of my Castelli and Assos ones look as good as the day they were bought.
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It is marginal gains, you pay a lot more for fairly small improvements, but if you ride a lot then stuff needs to work. If you only ride once a month then anything would do.