Hi zhangkan,
It would improve the airflow yes.
I’m not sure if you are asking about toppers or mattresses but either way there really isn’t any way to answer this specifically because the question is too general. If you are talking about toppers then it would depend on many variables including the type and blend of latex you are buying (some types of latex are more costly than others), the thickness of the layer, the specifics of any cover or quilting material that is included with the topper, the return or exchange policy that is built in to the price of the topper or layer, and any other variables that can affect pricing but depending on the specifics then you probably wouldn’t need to go any higher than $500 for a 3" topper or latex layer and in many cases they are available for much less. If you are making “apples to apples” comparisons between toppers or individual layers then the prices in the list of online components here are certainly good reference points for “value”.
There is also more information about the different types and blends of latex in post #6 here.
If you are asking about mattresses then once again there isn’t a “formula” that can be used to assess or “calculate” value because there are so many different variables and criteria involved that are more or less important to different people that may be very different from someone else that can affect the price of a mattress and because the “value” of a mattress purchase is always relative to how they compare to the other finalists you are considering or to the other mattresses that are available to you in the area or online based on all the parts of your personal value equation that are most important to you.
There is also more about the 3 most important parts of the “value” of a mattress purchase in post #13 here which can help you make more meaningful quality/value comparisons between mattresses in terms of suitability (how well you will sleep), durability (how long you will sleep well), and the overall value of a mattress compared to your other finalists based on suitability, durability, and all the other parts of your personal value equation that are most important to you (including the price of course and the options you have available after a purchase to fine tune the mattress or the exchange/return options that are available to you).
There is also more general information about mattress budgets in this article that may be helpful as well although of course these are very generic and can’t be used to assess the “value” of a specific mattress.
As you probably know … both Arizona Premium and Flexus are members of this site which means that I think very highly of both of them and I believe that they both compete well with the best in the industry in terms of their quality, value, service, knowledge, and transparency.
Phoenix