So in the end was it worth it?
For me, in this instance maybe not.
If we assume no one makes a purchase in the next 30 days then really After the boost I am back where I started with no more social standing and no sales. And £2 down.
While I saw a huge up tick in traffic, its temporary and hasn't really achieved a lasting effect.
So Facebook boosts are no good then?
Well that is not really true, this was just one case and they may well produce better results in other cases. It was a big purchase I was asking of people (£800 +) Its not really something you would do on a whim. I think Facebook boosts would work much better for more throwaway products.
What the Study shows is that a very small outlay WILL put your post in front of a big audience and IF your promotion is appealing/interesting people WILL investigate. Only you can really decide on a post by post basis if the promotion you are offering is likely to return results from people casually browsing Facebook.
Most sales come from people researching with intent to buy, Facebook Boost doesn't really help in reaching that audience.
Personally I found the Lack of Facebook interaction most disappointing.
But my final thought is you should definitely give it a shot. It's only £2/$3 for the cheapest boost. It really can't hurt much to give it a go?