Returns the contents of the event cost field without applying any formatting tricks.

ecp-cost-field.php

<?php
/**
 * Returns the contents of the event cost field without applying any formatting tricks.
 *
 * Useful in those cases where a non-standard cost values such as
 * "ABC-123" is used, else they may be "mangled" by the
 * Tribe__Events__Cost_Utils object.
 *
 * @param  string $cost (unused)
 * @param  int    $post_id
 * @return string
 */
function verbatim_cost_field( $cost, $post_id ) {
	return esc_html( get_post_meta( $post_id, '_EventCost', true ) );
}

add_filter( 'tribe_get_cost', 'verbatim_cost_field', 10, 2 );