Does Bitcoin have any logical legal use?

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If course it has a legitimate purpose. It's a medium for storing value, and its more liquid than other investments. Unlike government-backed currency, Bitcoin purchasers know the exact supply of Bitcoin on any given day. While Bitcoin is not backed by the good faith credit of an entire nation, Bitcoin is not artificially propped up by foreign exchange reserve hijinx, either.

Some have said that strict supply controls will lead to perpetual deflation, thus, the currency will never actually be used for anything other than speculative hoarding. The Austrian school has given ample evidence that free spending can also result from deflationary cycles, due to basic human psychology.