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Why can't you just have someone invest for you and split the profits (and losses) with him?
I'm answering this from a slightly different angle, but there are people (individuals) who will do this for you. I know private Forex traders who are 'employed' to manage Forex trading accounts for wealthy individuals. The trader takes a percentage of the wins but is also responsible for a percentage of the loss (if there is a loss in a particular month). However the fact that the trader is able to prove that they have a consistent enough trading history to be trusted with the large accounts generally means that losses are rare (one would hope!). Obviously they have contracts in place (and the terms of the contract are crucial to the responsibility of losses) etc. but I don't know what the legalities are of offering or using this kind of service. I just wanted to mention it, while perhaps not being the best option for you personally, it does exist and matches your requirements.  You would just have to be extremely careful to choose someone respectable and responsible, as it would be much easier to get ripped off while looking for a respected individual to trade your account than it would be while looking for a respected firm (I would imagine).