You can restrict the display of prices and only allow items to be added to the cart for logged in users. This might be useful if, for example, you are a wholesaler and only want your retail clients to be able to see your prices.

		/**
 * Hide prices and cart buttons if user not logged in
 */

add_action('init', 'sc_woo_hide_price_add_cart_not_logged_in');

function sc_woo_hide_price_add_cart_not_logged_in() {

  if (! is_user_logged_in()) {
    remove_action('woocommerce_after_shop_loop_item', 'woocommerce_template_loop_add_to_cart', 10);
    remove_action('woocommerce_single_product_summary', 'woocommerce_template_single_add_to_cart', 30);
    remove_action('woocommerce_single_product_summary', 'woocommerce_template_single_price', 10);
    remove_action('woocommerce_after_shop_loop_item_title', 'woocommerce_template_loop_price', 10);   
    add_action('woocommerce_single_product_summary', 'sc_woo_print_login_to_see_prices', 31);
    add_action('woocommerce_after_shop_loop_item', 'sc_woo_print_login_to_see_prices', 11);
  }

}

function sc_woo_print_login_to_see_prices() {

  echo '<a href="' . get_permalink(wc_get_page_id('myaccount')) . '">' . __('Login to see prices', 'theme_name') . '</a>';

}