I think that you are missing the point of our arguments. As griffin said you cannot judge everything equally bad in such a black and white manner - You have to also assess the context of the release in question.
If Wingblade Prime kit was suddenly and deliberately announced right after Hasbro had announced their own release then yeah it is a knock off and on top of that its not worth it as the custom is likely to cost as much as the official release as its a lower end toy plus it comes with an official 'adapted' Prime figure to fit the armor but that's irrelevant to the topic in question since this scenario has not happened and we are talking about what makes a custom kit 'good' or a KO. However if Hasbro had announced or it becomes clear that there would never be a Wingblade Prime then that validates the existence and relevance of the kit. It's basically all about context.
MP Grimlock on the other hand is a very expensive high end toy which was supposed to come with a crown which happend to be missing from the final product - Just the crown. Not many people would go forth and spend the same or more likely an increased amount again ranging from $250-$300+ on the same toy only for the crown. The custom crown is only $15-$17 before shipping and 'completes' your first release Grimlock and if it wasn't for the kit several Grimlocks would simply remain 'uncrowned' with the owner not bothering with the new release. Using myself as an example, if the only difference between the first Grimlock and King Grimlock was just the crown I would not have bothered with the newer release at all with or without the custom crown available.
Truth is often a matter of context and perspective such as with Fan Kits. I see the term of 'An inconvenient Truth' on this topic as none applicable as you are trying to enforce a generalized but absolute term of 'True/False' on something that is very much a gray area that can become 'moral' or 'immoral' depending on the context in which its used as well as execution.
This Wingblade Prime a clear knock off and I consider it as bad in a similar way as the miniature MP Prime for reasons already explained:
