If you're voyaging long distance especially to places where there are no diesel shops, it is wise to carry one or two spares. But if your sailing is local or even coastal, I wouldn't bother.
And having been in the trucking business all my working life, I have heard for the first time that servicing injectors is a dodgy business. In my career I have seen thousands of injectors successfully serviced over and again. Unless we're talking about the tip only which is generally replaced when the injector is serviced.
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"Two possibilities exist: Either we are alone in the Universe or we are not. Both are equally terrifying."
Arthur C. Clarke