I would also like to hear the answer to this question - would the mastercoin foundation put more "private exchanges" on the webpage?
I think buymastercoin.org typically handles orders from buyers that are new to mastercoin that don't know the MSC/BTC price and instead of doing the smart thing and check they are effected by the foundation webpage I am new here and I contacted buymastercoin.org in the beginning and almost did the "mistake" of buying from him because I thought its "recommended" by the foundation.
There were a few posts of new buyers of MSC that felt a bit misled by the foundation.
I dont know many anonymous buyers that want to buy at X3-4 the market price, instead of buying anonymously using the order book.
I did do the mistake to use buymastercoin.org since they were listed on mastercoin.com. Of course I got upset when I realized I lost 2000 or 3000 dollars. I do feel tricked by both buymastercoin.org and mastercoin.com and also from the mastercoin foundation. Non of them seem to wanna make a public statement regarding this. I think Mastercoins is great, but right now I'm not sure if I can trust the people behind it and would really just want my BTC back. I did ask them in an email but they refuse, even if it was only 24 hours after the trade was done. Of course, they are probably getting some hookers and booze right at this moment. Argh.

Hello guys,
As most of the people here I got really interested by mastercoin features in the recent months, however the google doc "order book" is not an very simple solution to trade mastercoin, and I feel that neither is the buymastercoin website which for many reason seems like the official recommended solution.
Thats why we have started developing an "real" exchange (where people can set up their own prices) for mastercoins / bitcoins which should be ready hopefully in a few days. Most of the development is done and we are just testing the system right now. So until the distributed exchange is there we will be offering a convenient way to trade mastercoin, hopefully helping in the price discovery process and proposing a fairer price than the current easy to use solutions.
Ps : I am not in any way related to the mastercoin fundation or do have any mastercoin. Also note that we are doing this project outside of any official mastercoin bounty.
This is the best thing that could happen to the mastercoin project at this moment. Wish you the best of luck and hope that the mastercoin fundation will accept your site instead of the fucking buymastercoin.org