lol yea, .05% is still around $70,000 a year.
Depends entirely on how it's invested, even with a basic savings account you can find some that offer 1% of slightly more giving you a little over a million a year back. Other investments can get you a hell of a lot better rate then 1% and still be pretty safe. Most banks will be more then willing to offer you a better rate just for sticking 100 million into their bank.
First of all, why would you go public when you've just won a complete fortune?
Second why should they not get the whole jackpot?
They already paid taxes and the money they had left over they used to buy a ticket that should go also to good causes.
British and Euro-Millions doesn't charge any taxes and if you win £200,000,000 you get the lot, lock stock the lot.
Depending on state law, some states allow you to remain anonymous others require you to go public. Stupid law but that is what it is.