My gut feel is that this is a bogus post and that the OP is a competitor of the original listed currency exchange, and probably affiliated with the one they have mentioned as being great.

If it is legal to transfer money in... the banks will do it competitively, or they would not get the business. If they exchange small amounts of $, then the same would apply to large.

As mentioned if someone feels they need to be under the radar of government eyes... then it is probably an illegal transaction... and that's too bad if they get ripped off. I guess the price of ethics.