Hello Pedro! I'm from Venezuela and last year I was selected but didn't make to the interview (high CN). My tourist visa expired last year too, and I didn't renew it at the moment because I was in the process to get the GC. Obviously, after my big fail I also needed to renew my tourist visa and was expecting a few problems.
First, I had to put in the form that I did have immigration attempt. Then the CO interviewed me... it was clear that he needed to know if I was a risk for illegal immigration. Finally I told him: "Do I want to live in USA??? OF COURSE I do!!! But legally... I won't live there with the "migra" chasing me. If I wanted to do it in a non-legal way, I would have been there already. And I tell you, I did participate again in the lottery." He told me I was very sincere and renewed my tourist visa for 10 years again.
So... I was scared, but it worked out.