I think I've met someone with the same oppinion!
I'd like to get rid of them for good, don't know how though... Is it possible to 'hide' the diff somehow? Or to make the diff higher to begin with as a very big miner joins in? I know theese suggestions aren't really fair either, but they really rape the market!
If the people who own the exchanges take the long term view (a week rather than a day) on the income they wish to make from trading, then they would just ban or confiscate any coins from the multipools and share with the people mining/trading/holding the coin.
Just think if you were the first exchange to publicly announce that you would confiscate any coins that you discovered were deposited by multipools and automatically add them to the balances of the other holders of the coin based on the the percentage of the coin they hold on your exchange...
The only people buying a coin are those that either A) believe in its long term value, or B) believe it will rise in price shortly. Neither A or B are helped by multipools, so imho no buyer of LEAF would benefit from the mass sale of coins by a multipool.
So in this scenario, we have a group of buyers that dont want to see a multipool dump. A group of sellers that also dont want to see a multipool dump and ruin their chances of selling at a decent rate.
Along comes a multipool and deposits X Million coins, much more than any other single user and instantly sells. In future, if these coins were just confiscated and distributed among the true holders of the coin, then this would cause a sh*tstorm of publicity. Every single person trading that coin who believes in it would jump onto that exchange to trade, increasing the exchanges commissions massiveley. The people left behind on the other excganges would fear that the multipool will just dump there instead, so they will leave.
Results:
It may promote higher prices on an exchange where multipools have their deposits confiscated.
Multipools will only then be able to sell at rock bottom prices elsewhere, which gives true traders a bit of a bonus.
If this action is taken on all coins on that exchange, then multipools would be forced to drop all those coins from their hit list
Multipool drones will not be very happy having mined for maybe hours, for zero and will become disilusioned with the whole multipool idea.
Multipools eventually die.
If there is a way of spotting multipool trading on an exchange and taking this action, then the exchange will receive massive positive publicity from the altcoin network. The first exchange to take this action would see a massive influx of trades. The only way that other exchanges will keep their market share would be to take the same action. Eventually all exchanges would have to do it to survive. Which in turn, would kill the multipools dead. No need for any gravity well, just common sense at the exchange level.