Whoa... wasted time to research that skin1/customer/products_prices.tpl actually does nothing since the working horse there is javascript.
Find in your skin1/modules/Product_Options/check_options.tpl lines
Code:
{if $product_wholesale ne ''}
{foreach from=$product_wholesale item=v key=k}
_product_wholesale[{$k}] = [{$v.quantity|default:0},{$v.next_quantity|default:0},{$v.taxed_price|default:$product.taxed_price}, [], {$v.price|default:$product.price}];
{if $v.taxes ne ''}
{foreach from=$v.taxes item=t key=kt}
_product_wholesale[{$k}][3][{$kt}] = {$t|default:0};
{/foreach}
{/if}
{/foreach}
{/if}
and change to
Code:
{if $product_wholesale ne ''}
{foreach from=$product_wholesale item=v key=k}
_product_wholesale[{$k}] = [{$v.quantity|default:0},{$v.next_quantity|default:0},{$v.taxed_price|default:$product.taxed_price}, [], {$v.price|default:$product.price}];
{if $v.taxes ne ''}
{foreach from=$v.taxes item=t key=kt}
_product_wholesale[{$k}][3][{$kt}] = {$t|default:0};
{/foreach}
{/if}
{/foreach}
_product_wholesale.reverse();
{/if}