"why is a ten cent transaction not practical?" There certainly is no serious technical barrier. It looks to me like a license to print money, without a license if you find the right base of operations.
Does anyone have experience with any of the e-bay accounts where you transfer cash in using larger increments then use the account to pay for whatever trash you buy? (we won't judge you for knowing)
or these guys...
http://www.e-gold.com/