Each applicant for the ticket ballot - the first was held in September, the final one will be held at the end of this month - could buy only four tickets.
However, touts have access to sophisticated software that has allowed them to harvest tickets by assuming multiple identities.
Fans are being warned that every time they buy on the secondary or on-sell market, they not only empower the touts, but are also at risk of buying fake tickets.
"You need to be really careful," said David Caldwell, general manager for All Blacks Tours. "You could find yourself being turned away at the gate.
"That would be incredibly disappointing."
The demand for tickets for this tournament has been unprecedented. Although there will be around 2.3 million tickets sold, only the capacity of the grounds is holding organisers back from selling more.
While some of the games between minnows in pool games will remain a hard sell - Namibia v Georgia in Exeter, anyone? - matches like New Zealand against Argentina at the massive Wembley Stadium, capacity 90,000, could have sold twice over.
The crunch games in the "pool of death", which includes favourites England, Australia and Wales, could also have sold several times over.
It's this classic scenario of under-supply and over-demand that has provided such fertile ground for ticket cheats - and which leaves the ordinary punter so vulnerable.
Tips to beat touts:
• Get tickets in the ballot, which will be held at the end of November
• Buy only from licenced operators. A list can be found at rugbyworldcup.com/ticketing