Hide the active sale from users with level ID 1, 2, or 3.

my_swsales_hide_from_premium_members.php

<?php
/**
 * Hide the active sale from users with level ID 1, 2, or 3.
 */
function my_swsales_hide_from_premium_members( ) {
	
	// Return early if this is the admin.
	if ( is_admin() ) {
		return;
	}

	// If user has membership, don't activate the sale.
	if ( pmpro_hasMembershipLevel( array( 1, 2, 3 ) ) ) {
		add_filter( 'option_swsales_options', 'unset_swsales_active_sale_id' );
	}
}
add_action( 'init', 'my_swsales_hide_from_premium_members' );

/**
 * Return 0 (no sale active) for the swsales_options option.
 */
function unset_swsales_active_sale_id() {
	$option = array( 'active_sitewide_sale_id' => '0' );
	return $option;
}