I wouldn't buy it. When I had my bath & body shop I did the showcase A LOT. and it never generated a single sale... my views went up (not dramatically) but i felt like it may have been other sellers in the soap category who were checking out the competition (because I know I was).
Checking your titles, tags, SEO, using your best pictures possible, back-linking, tweeting, FBing, getting involved with blogs and the odd give-away - THOSE things work.
In my opinion, the paid showcases on etsy never worked.