Why should I buy a 50mm prime lens?

Challenge #5 in the Opportunities series. Hosted by juanlucas.
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I made a mistake... haven't bought a 50mm prime lens yet. Show me why I should buy it!! MANDATORY to indicate brand/model of lens used for taking the picture (of course, only 50mm prime lens for this challenge).
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The sounds of Bourbon Street
by Rolf_52
Click here for full size original image
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captured with a Nikon prime 50 mm...you should buy it because it provides the benefits of a large aperture at an affordable cost
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Lens:
Submitted: Thursday, 30th June, 2011 15:52 (GMT)
Taken: Sunday, 3rd April, 2011
Focal length: 50 mm
Shutter speed: 1/250 sec
Aperture: F1.8
ISO: 3200
Notes: basic pp
Views: 378
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