Because now there is no way to know if the picture can be made larger or not. The only way to know is to click on it.

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.thumb img:hover {cursor: url(images/my-cursor.png), auto;}
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<div class="thumb"><a href="blah.jpg"><img src="blah.jpg" width="200" height="200" alt="blah" /></a></div>
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img:hover {cursor: url(images/my-cursor.png), auto;}