Is there any potential harm someone could do with your wallet address? I have just found out that they can search for all your transactions, so if you had a high balance you would be a potential target??
So would walking down the street all bling'd up to the hilt. Keep your stash in a safe place (such as a paper wallet), but be sure you understand how it works or you might just lose everything. Practice on some small sums before committing your life savings.