I have to agree with the previous posts about how uninteresting most BOGO offers are if the buyer cannot choose which BOGO gift he or she wants.  I have also passed on all BOGO offers if  they only offer a random gift rather than allowing me to choose one (as some sellers did in the past), because I am generally interested in less than half of the gift items, often because I already have several of them.  If Renderosity and the sellers would permit us to choose our gift, I would frequently take advantage of BOGO offers.