Another thing,
While many of us are tempted to promote BTS with a high % yeild or a referral program, this is probably not the crucial selling point for merchants. Professionalism, speed, reliability, efficiency and simplicity I would assume is what merchants want. They just want to focus on selling their beloved products without having to worry about all that jazz.
I agree with Rune that when we are pitching BTS as a bank or personal vault it is at least worth looking very seriously into the idea of fixing a high yield, but I agree with Ander and Clout here that Rune's analogy to BTC regarding sell-pressure from merchants fails in the case of bitUSD: at least bitUSD demands collateral.
But we need to be careful here. If total supply of bitUSD is shrinking, then it seems to me there will likely be BTS sell pressure. At least it would matter a lot if we prevent merchants going out of bitUSD right away, and rather have them hold on to it a while, say 30 days ..
Think velocity: If we double the average holding time from buy (USD-->bitUSD) to sell (bitUSD -> USD), we double the minimum market cap of bitUSD as well. In the limit, if bitUSD was used the very trillionth of a second it was bought and sold into USD, then we would only need 1 bitUSD market cap to do a trillion bitUSD worth of transactions per second.
?? Am I thinking straight