/sarcasm mode
I don't look at my pictures with a light meter, so why should I use one when I take pictures?
/sarcasm mode

OK, that's an irrelevent comparison (mostly). But the fact remains that some people find an SPL meter helpful. Hell, even if it's nothing more than wishful thinking, it's cheap ($30) wishful thinking! Personally, I've found that I can get my system adjusted to a point that I like more quickly with some help from a meter than with my ear alone (which means I can be enjoying it sooner), so I use one. Personal preference. YMMV.

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