There are always safeguards against scamming which can significantly decrease the likelihood of being scammed, however that's still a very large percentage of scammers.
It might've been the amount of people that have tried to scam him.
A fully downloadable game as an option could help users run the game at max settings with no lag etc. whilst still being avaliable to be played on a browser.
Nice trick that I didn't know about. I usually just split the Runescape lobby screens and press 'login' as quickly as possible on both screens at the same time.