To give an example of the numbers, if the target price was 5 litoshis, with BARR @ .00016btc, then the exchange rate would be set at 400,000 BUN for 1 BARR.
Looking at how the market has been going, we are probably going to set the target price of BARR much lower than that.
We wanted to keep raising the price of BARR, but we don't want to set an unrealistic goal.
We want to offer an increased price for the altcoins, but we don't have unlimited money.
So lowering the price of BARR will allow us to offer a higher rate for the altcoins without overextending our funds as much.