First of all, thanks for the SBI :)
I like your idea/thinking.
Actually, I have no idea how many different steemians already received SBI from me.
Last August I did a statistical post where I made some conclusions about my contest.
Some overall figures
How many SBI were given away last year?
The total amount of SBI (1 SBI = 1 STEEM) given away was 290!
That's 5.6 SBI every week.
How many participations and unique participants did we have?
The total amount of entries/comments/participations was 1455 which is an average of 28 entries every week.
These entries were made by 299 unique steemians.
So I assume that 200+ different steemians received SBI last August already.
This might be the reason why I am also a number one target for him :)
Let's spread the word ;)