I have always thought that scientific patents are more valuable in the industry to companies compared to other commodities hence I put higher price tag on royalty. I have seen royalty deals from as low as 7% to high 12-14%. This is based on pharmaceutical sector deals. But 3-5% seems too low for this IMO. May be I'm too optimistic but thanks for your insights on this. The end numbers are still great. We will find out soon ! GL