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LauraABJ comments on Money pumping: the axiomatic approach - Less Wrong
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Fair point. A better example would be that said money manager convinces the client at each trade that it is in his interest based on his preferences, when really these preferences lead back to where the client would have been if he hadn't traded at all (minus the manager's fee of course), but the client is unaware that his choices did him no good, because of marginal gains anyway. Unless you mean to say the pumped party must be aware that he is back where he started in order to be considered a pump.
You can see this in several ways - either the client is being inconsistent, as he makes different decisions based on how the the choices are presented; or he is being cheated by the money manager who lies about the value of the trades in question; or the client simply has non-independent preferences, which the money manager is exploiting (strict weak money pump).
I'm not sure either of the explanations is better than the other in this set-up; you'd have to experiment with the situation, change some variables, and see what comes up.