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Here is a RGP thread that discusses this very issue. You might recognize a poster or two....
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That's an interesting thread, but the issue it discusses is pretty different. One initial huge buyin is different from rebuys. Also, note that Feduniak specifies that only Hero is allowed to rebuy. If others can rebuy as well, then I think more information is needed to make a good assessment of the problem, as your EV is no longer going to be a function of just your stack size, but also how much the prize pool has been inflated by others and how their stacks impact your chances.