The Fairy Tale Collection was introduced by the fast food chain in early June, and has since caused havoc on the streets of Singapore with hundreds of people queuing for up to six hours to purchase the plush toys and complete their collections.
However, there were a number of customers who were queuing with a different motive - to make a profit.
The final and most popular toy in the series, the Singing Bone, was based on a disturbing German fairy tale by the Brothers Grimm.
Hundreds of people began queuing the night before the release, and the toy was sold out within 24 hours.
It had been reported that one of the toys sold on eBay for around £65,000, but this claim was later dismissed as a joke from a fake bidder.
The second highest auction ends on July 4, and the bidding currently stands at £2,642.
Hundreds of the toys are being sold online via eBay, Facebook and other social networking sites.
McDonald's restricted the amount of toys each customer could purchase to four.
The official McDonald's Singapore Facebook page said: "We do not support people buying the Kitties for resale, and we have been regularly removing posts offering such services from our page.
"We take the conduct of our staff very seriously and if any of them are found to have misappropriated the Kitties for personal gain, we will not hesitate to take appropriate action."
The "Kittydemic", as it is now being referred to, echoes a similar incident that took place in early 2000 when Singapore McDonald's released a series of Hello Kitty dolls in wedding dresses to celebrate the millennium.
Police were inundated with reports of fights, fainting and traffic congestion.
For the latest collection, in order to meet public demand, the company increased the amount of Kitties available for purchase by 40%.
However, there are still genuine die-hard fans who are just looking to complete their collections.
Fan Bellerinaxx spoke on Twitter of her experiences in the queues: "Waited 5 hour plus for these last night #hardshy ALL MINE NOW #hellokitty #love #singingbone...".
Japanese company Sanrio Corporation created Hello Kitty in 1974, and the phenomenon is now worth around $5bn (£3.29bn) a year.
