No,
you must comment this code:
<?php //echo $rowsHeight[$row]['customs'] ?>
<div class="vm3pr-<?php echo $rowsHeight[$row]['customfields'] ?>"> <?php
echo shopFunctionsF::renderVmSubLayout('addtocart',array('product'=>$product,'rowHeights'=>$rowsHeight[$row], 'position' => array('ontop', 'addtocart'))); ?>
</div>
inside:
components/com_virtuemart/sublayouts/products.php
or as override
templates/TEMPLATE/html/com_virtuemart/sublayouts/products.php
(Don't forget on sublayouts - products_horizon.php and products_slim.php if you need).
P.S.
But we use in our eshop another code, because this sublayout we loaded inside own modules or popup Add to cart or megamenu.