Interesting to know,are you using Razer silver for ''redeem to win".? ( How often You do that and what was results.? )
I enter every once and a while, mostly when I have silver about to expire that I do not want to go to complete waste. I haven't won one however, haha.
I'm with Jenjar in this question. If I have soon-expiring silvers, I would use them like this (redeem actions). Sadly I just came back to Cortex and Razer Insider some time ago, so I don't have any experience with these kind of Promotions/Giveaways yet.