500k a month to keep BU propped up,
You seem to be making a claim that some party is expending "500k a month to keep BU propped up". Care to substantiate this? Who is the party making this expenditure? In what way is this expenditure 'keeping BU propped up'? How do you know this to be the case?
In an interview, Charlie Shrem made the claim that Roger Ver is spending $500,000/mo to "keep BU propped up". No more details than that were given. Charlie Shrem was the owner of BitInstant, which Roger Ver was a large investor of. Roger Ver denies the claim.
However it is known that Roger Ver is funding >90% of BU development. It's likely he also has other expenses too. How much all these expenses total up to is difficult to figure out.