I think perhaps it is time to convert more of our BTC to MSC. I'd rather have MSC in a rainy day fund than BTC anyway. As you say, giving away BTC attacts people more interested in BTC, and I'd rather the foundation hold MSC than BTC.
Here's my crazy proposal:
1) Keep only the 1000 BTC we've already moved into offline wallets
2) Use the remainder of our BTC to purchase MSC over the next few months on the distributed exchange
3) Pay all future bounties exclusively in MSC
4) Keep half of our MSC money for a rainy day and/or future distributed bounty system
5) If our rainy day fund becomes excessive, we can always vote to lower the ratio later
I realize that this would potentially make all of our existing investors absurdly wealthy, but, well, the stated purpose of the Mastercoin Foundation is to serve the holders of Mastercoins, and I'm having a hard time seeing this course of action as anything but a huge positive for them, as long as we do it transparently and over a long enough period of time that nobody who wants to sell to us is left out.
Also, MSC prices would probably go up to the point where I'd sell 1% and quit my job to work on MSC, which I hope would also be in the best interests of our investors.

JR,
As an investor of Mastercoin and as someone who cares about this project I just don't agree to this approach.
Let's be honest with ourselves: the reason that MSC currently worth money is mainly (or practically only) because of the BTC invested in it. The intellectual property of MSC is still very low. We have nice ideas which are not yet implemented and there are only few experimental websites and few experimental wallets and that's it. The number of developers that are currently working on the project is still very low.
The echo system of MSC is very close to zero.
This is why I think that selling the foundation BTC will kill the project.
BTC has value that attracts people. It can be converted to any fiat currency, it's price is rising. Investors are looking at this and understand that the foundation has the ability to make this ambitious project happen - this is the reason that MSC worth money at the moment IMHO.
Like everyone else in the world - I love easy money, but this idea just confuses me.
This idea reminds me of USD - printing money out of air.
If the foundation is going to be left without BTC - why we even raised it just few months ago?
B.T.W
I think that we need to have at least 1 million USD as fiat money, to reduce BTC risk