Fiverr observation - real customers or fake reviews

So I was browsing Fiverr for some arbitrage ideas and checking out some obscure services offered. I came across one and lets call it "psychic reading" and one seller had several services and I've looked at one that had over 2000 reviews out of curiosity. The seller had $30/$40/$50 services and I wanted to see what kind of comments people left. I was shocked to discover that there were a lot of repetitions in customer reviews. There was one person that I've seen post 75% or more in last 3 months and other names that I've seen 10+ times. I wasn't really studying it hard but one account dominated. I'm sure if I went on the same account would be there going back many months

So is it possible that one person buys 200+ psychic readings at $30+ over course of 3 months and as a single customer represent 75% or more business for Fiverr seller or do you think these are fake reviews to help seller overall?

PS. Seller's other listings had under 100 reviews each.

*** UPDATE - I went further back in reviews, for the last 4 months 1 account accounts for 75% or more reviews. Older then 5 months there is another account which dominates most of the orders. Overall I think 2 accounts account for 75% of all purchases in last 9 months, several other accounts that bought 20+ psychic readings.