It's the same with Las Vegas route, that is mostly leisure, these kind of flights should be at Gatwick leaving Lhr as business only.
Fundamental misunderstanding. Do you recall the short lived LGW-LAS operation that was dropped? The limited options direct from EU-LAS mean LHR-LAS does very well on connecting traffic which is an essential part of the hub and spoke business model. LGW long haul with BA and VS is point to point, very little ex-EU to former UK Caribbean possessions, a Hell of a lot of ex-EU to Vegas, hence lack of feed a Gatters means this is a LHR route.