Rugby league star Hunt announced on Wednesday that he would be switching football codes to play with Gold Coast.
Hunt, 22, has played for the Brisbane Broncos in the NRL since 2004 and represented Queensland and Australia. He is expected to join Gold Coast in May 2010.
But Roos says he's not expecting the floodgates to open and a rush of other NRL stars to follow suit and jump across to AFL.
"The games are so dramatically different. There's not a lot of cross-over. Obviously tackling, a little bit in kicking, but in terms of the games, they are very, very different," Roos said on Thursday.
"It's a new, unique situation with a new franchise (Gold Coast) coming in. It's a player who has a background in AFL footy, and obviously a high profile player and a great athlete."
Roos added that Hunt's signing was already a success from a marketing point of view but said those NRL players with no background at all in playing Australian football would struggle.
"Clearly there is a part of it that's a huge marketing component to get him coming across. And I think the figures they're paying him seem quite exorbitant.
"But if you look at the marketing and advertising they've got out of it over the last 24 hours, they've probably got it half back already.
"We all wish Karmichael the best but I wouldn't imagine you'd see a lot of clubs rushing to rugby league because it is a very, very different game."
Roos has his own code-swapper at the Swans in Mike Pyke. The Canadian played for his country in rugby union before joining the Swans this season.
However, playing in a specialist position – the ruck – has eased the tall, athletic Canadian's transition into the AFL. It's different, argues Roos, for those players who would play in other positions on an AFL list.
"A midfielder has got to get the ball 20-30 times a game, use it well and make decisions in terms of where the ball's going, where the structures are, where to stand, and those things. So it's a vastly different role to Pykey," Roos said.
"I'm sure everyone will be looking at it – like they will with Mike Pyke – in three or four years time as to how it went."
