If you fly EVA Deluxe class you get a biz class seat without the full service and full recline for about 30% extra not 300% extra. As I understand VS is a slighty bigger Y seat and a few inches of legroom which hardly warrants the price. For example if you pay aboout £600n with KLM for y seat you can reckon a 60" full recline biz seat will be about £1800