Giveaways are fun.  They are your coins, you can give them to whomever you want.  It sucks that some people are taking advantage of your good nature.

Those steps look like good steps, but the simple fact is with all the account farming that has gone on here there really isn't much defense against opportunistic people.

Good luck and while I have not gotten any of your giveaways I think it is a really nice thing to do!