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My assumption is the introduction of the Tein FLEX and so everyone is hopping on the bandwagon. Plus there's the EDFC. And you know how people are at new advancements.
My only issue from what I have heard and read is the Tein HA is much stiffer in ride but some love it and some don't.. Price wise it is much cheaper than the new kid on the block TEIN FLEX so I guess you will see more HA's / Other coilovers on the used parts market.. Just my thoughts on this subject..