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Why not an accumulator? Much cheaper and serves a similar function. Saves the motor from starvation and low-pressure cold starts. There are also some accumulators that can be set to run after shutdown to preserve the life of the turbo. Borg Warner engineer says that this would double the life of their turbos for example.
Only advantage I see to some dry sump setups is that the engine can get upside down for an extended period of time. That and the obvious crankcase ventillation/oilsystem improvements. Having crankcase vacuum that doesn't pull against a wet sump oil pump I guess. It just seems a huge hassle though, considering it has nothing to do with 'power' unless you are restricted to a specific engine. I.e. an LSx could make 1000 horsepower with a wet sump and nothing special done to the oil system. So in an unlimited class you wouldn't say "oh I need a dry sump to make 1k horsepower" you would just use the right engine.
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