The ratio of rewards received to investment amount is not higher today than it was at the beginning, but it might be higher than at some other point after they adjusted the odds, presumably to keep the program sustainable. Other factors such as declining popularity of the website might also be contributing to its current unsustainability.
That initial odds were a great gesture of generosity from the Freebitcoin team. I don't know if they did it consciously or just miscalculated, but it's obvious that period was extremely profitable for users.
And as for declining popularity, if you look at the traffic
stats, freebitcoin had more than 28 mln visits in the last month. That's quite a lot, considering the site has been having some problems lately.