Pabely - I was going to mention this. There are a substantial number of routes at LTN which are unserved or poorly served by LHR or LGW. Perhaps this gives cause for connections to south and west London ? If I was from Romania and living in Reading and wanting to see family... a coach from Paddington to LTN would be of interest.
Or maybe there really are a lot of cheapskates like me who just care about which option overall is cheapest and will happily spend an extra hour on public transport if it saves substantial cash ?