You see so many people complaining how difficult it is to connect to their Gatwick leisure flights due to only really flying to LHR or because the other airlines don't connect at a convenient time.
Virgin have up to five flights per day out of Gatwick, 21 per day out of LHR, upped to 31 if you throw in Delta's JV flights. You can see why they went for LHR. BA only have ten flights each day out of LGW on long haul, the vast bulk before noon. Hence only one of your (minimum) three daily flights is feeding. This is why Heathrow is a hub and Gatwick remains point to point leisure focussed.
Clearly this is nowhere near enough and we should be looking at shuttles every 15 minutes ! Although given Virgin are pulling out I may have spotted a flaw in my business plan !
Not sure what your point is bagso?
BA's yield on GLA was much improved when bmi dropped the route, prices went north rather quickly.