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The only benefit I can see for having one (and getting back a positive result) is that it allays some of the fear of getting it and possibly dying from it.
Although a negative result could just increase that fear and, even if you did get back a positive result, there will always be that nagging doubt in your mind that it was a false positive test.
So, to answer the actual question asked, it might not put you in a better position than not having it. If you've got the £69 spare then and you're not bothered about the above then I can't see any other reason not to.
Why should I not order one of those antibody tests?