JDM has been thrown around so loosely in the past few years, everything listed on ebay seems to have JDM somewhere in the auction...of which 99% of them aren't even really JDM anything.
Anything sold that is not a known brand from a known distributor or manufactuer should be passed up or researched deeply....but that initself is a hassle and i'd rather buy the real deal form the real distributors/manufacturers. That auction is obviously trying to tell you they are TEIN springs without directly saying so....S-TCH...WTF!?...that says they have no clue and can merely just re-manufacture parts or buy the cheapest parts they can find and slap a name on them thats close to what a good brand name spring has...
I agree, it's not ebay, it's the foolio sellers who trash it. (not to say all buyers are #1 either...but the product is not represented truthfully)