I will proove bcc cant worth more than 0.5% of bitcoin price :
BUY 1 bitcoin on an exchange, transfert it to an electrum wallet.
Short 1 bitcoin in the pair btcusd on an exchange, using fiat as a collateral to this margin position.
1 august, get your bitcoin cash and your bitcoin, send your bitcoin back to close your margin position.
send your bitcoin cash to viabtc and dump it.
I proved bitcoincash shouldnt worth more than 0.5% of bitcoin price as its the price it would cose now to you to get it, if not for free (actually i included highest fees possible to all those transaction, some whale can have it for totally free as they have low fees)
That is because when you short a bitcoin NOW, you are actually shorting a bitcoin AND a BCC after 1 august. Because the bitcoin you are shorting now has split in two. If, of course, your exchange is somewhat dummy, you may get away with just giving then back a "bitcoin-after" and put the other half in your pocket, yes.
You see, that's the other side of looking at:
"if I have pre-1-august bitcoins on an exchange, will they give me my post-1-august bitcoins AND my BCC coins after 1 august ?"
If you've shorted a pre-1-august bitcoin, that became a short of a post-1-august bitcoin and a short of a bcc coin. Unless you can do what some exchanges tried to do with the ethereum split: keep the other half of the spit coin in their pockets (coinbase tried that for instance). Yes, you could try to keep the other half of the split coin you shorted, in your pocket, true. If they aren't smart enough at the exchange (because they want to keep their customers' BCC for instance and don't see how they could tell you you've shorted BCC if they pretend it doesn't exist) you may get away with that.
But the rule is: a pre-1-august bitcoin = a post-1-august bitcoin AND a BCC.
In any financial operation that bridges 1 august.
You can understand this if you take, for sake of argument, the extreme vision that it is bitcoin that falls spectacularly in price, and that its market cap is essentially overtaken by BCC (I don't think it will, although it should: BCC doesn't have the original bitcoin name, and all bitcoin has, is a name, nothing else: it is that name that differentiates this old clunky crypto currency from all "alt coins" that work much better, but don't have the brand name).
Suppose that bitcoin drops to $100,- and that BCC is now at $2500,-. Redo your story. The exchange will claim that what you shorted was a combination of post-1-august bitcoin AND BCC. And they would be right. They could even say that they drop original bitcoin from their listings, and that for them, essentially, what was bitcoin before, is BCC now. Then your "proof" proves that bitcoin's value after the split cannot be more than 0.5% or so.