How to determine the value of a chess set? I'm buying this set.

It looks expensive, yet it's cheap. So how to determine the value of a set? How much does a first class set usually cost? Does it include a timer or any accessories? Are there famous manufacturers like D&amp;G in clothing? And what are the most expensive sets ever?
The value of a set can be pretty arbitrary. Things that affect the cost of a set include:


the materials from which it's made
the amount of skilled hand-work
the quality of the components
its rarity
size
accessories


The travel set you posted is unremarkable with respect to the attributes above:
 - it's plastic
 - none
 - historically low
 - not at all
 - small
 - magnetic board and carrying case.

Now, the same set coming from, say Germany, would get similar remarks except for the "quality" rating. I'd expect that a set from Germany would be made of better components; thicker plastic, better glue, and more careful assembly.

Now, value is a tricky beast.  The hypothetical German set I mentioned might cost $30. The Chinese set could have the same or better value.  You won't know until it is in your hand. For $17, you'll probably have a set you can use for a year or two.  Who knows, though, it could be amazing and last forever. Or it could arrive broken. Who knows.

I don't know much about travel sets.  A webs search should tell you what's out there. Then you can compare features.

I think the most luxurious sets are coming out of the House of Staunton.  You'll see some amazing sets there. Be prepared for sticker shock.  My personal insane favorite would be the set made from mammoth ivory.

Bigger is not always better, rarer materials are not always more practical, fancy is not always better than simple. HoS has more affordable sets, though many would not consider them so. The Reykjavik set has always been a favorite of mine. Boxwood and ebony are to me the perfect woods and a 3.75" King is the perfect size. The design is clean. It's $350.

What makes these sets a good value is that the wood used is rare, suited for the task, and of high quality.  The workmanship is where it needs to be. Skilled people are carving the knights (in some cases), the size is correct, the weights are correct, the styles are correct (don't take your Star Trek themed set to a tournament...), and they simply feel good to touch.