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There are many reasons. Cheap Chinese versions don't work properly on many cars because the makers skimp on many of the more expensive components needed for the full range of OBD protocols. By leaving out key regulating components the cheap versions normally burn out after a few uses.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.