Do you trust gigs that have a bunch of Positive Reviews by the same buyers?

So there are some gigs that I am considering buying, most of them for advertising of my new website. As a means to filter the gigs, I will always click on "Highest Rated", that seems to be working for me thus far. However, one thing I have noticed a couple of times with different gigs is that there will be a bunch of reviews, probably 98 to 99% positive even, but what makes me concerned is that when I look down that the customer review comments section, I'll find myself reading reviews from the same people "buyers". Its like I'll load more at the bottom and up will pop more reviews, and its like there will just be pockets of positive reviews (often the same text like "thanks great job") by the same people that I had just seen a review from up above.

Does anyone else see this happen frequently, and would you guess that this is just because the Buyer really likes the gig and keeps buying it.. or would you suspect foul play? Like the person that created the gig is gaming the system.... albeit I realize that the gig would need to be purchased in order to be able to deliver another positive review.. but some might suggest that by reinvesting some of those Fiverr Gig Dollars back into growing the Positive Reviews of your gig, that ultimately you will get more buyers and better placement on fiverr.com?

Just curious to see who might have an opinion on this and whether or not you purchased a gig that had this going on and how did that turn out for you?

Regards