For those uninformed, "MasterCoin" is an impossible attempt at pegging Bitcoin to the USD (among other things). It of course doesn't work because there's a limited supply, which means that the prices are raised and you're no longer pegged. The whole setup is essentially designed by the creator to make him and his "donators" rich (buy some now and get 10% more! was the original post).

Due to the ponzi-like setup, the people who paid 4 million dollars for "MasterCoin" are very, very vocal when it comes to promoting it.

https://blockchain.info/address/1EXoDusjGwvnjZUyKkxZ4UHEf77z...