I totally understand, I didn't know that there were many sites doing it, I thought it was only this one, PM me if you want the name of it.
The good thing about doing something against these sites is, if you take action against them, and shut them down, they will be discouraged from selling imgburn in the future because there will be the risk of getting shut down again.
They'll think 'Oh, I'm not gonna sell ImgBurn again, because they might take action against me and shut me down, I'm gonna look for something else to sell'.
And I'm not talking about taking legal action which is very costly, I'm talking about filing a simple DMCA complaint which takes 10 minutes to complete and it's free, so it's not like you'd have to do much work.
However, it's your call whether you'll take action or not.
BTW, Who is LUK! ?