The Dollar is not a D with a line through it... it's a $
The Pound Sterling is not a P with a line through it.... it's a £
Perhaps we're not thinking outside the box enough.
Then, let's think outside the box, first considering...
http://en.wikipedia.org/wiki/Dollar_sign#OriginThe sign is first attested in British, American, Canadian, Mexican and other Spanish American business correspondence in the 1770s, referring to the Spanish American peso,[1][2] also known as "Spanish dollar" or "piece of eight" in British North America, which provided the model for the currency that the United States later adopted in 1785 and the larger coins of the new Spanish American republics such as the Mexican peso, Peruvian eight-real and Bolivian eight-sol coins.
The best documented explanation reveals that the sign evolved out of the Spanish and Spanish American scribal abbreviation "ps" for pesos. A study of late eighteenth- and early nineteenth-century manuscripts shows that the s gradually came to be written over the p developing a close equivalent to the "$" mark.[3][4][5][6][7]
What may make sense is taking the B & C of BitCoin, then somehow superimpose the two letters to create something pleasant to the eye and unicodeable.