Thus is the problem. "Chances are" is not an exact figure and 9 out of 10 is 90%. This means that there are 10 chances out of 100 a devastating invasive plant species be brought in and can harm the local ecosystem. This is why when Lisa spoke with the customs import people they were adamant that under no circumstances should tourists be allowed to bring in seeds.
Isn't it just plain smarter to follow the laws on this since with your numbers you have a 10% chance of harming the island's ecosystem? And think of the risks involved if the 2 million visitors to the island all did the same thing?
Please folks, follow the laws on this one.