I would add just one rider to Llanfairpg's comment. Yes we are paid to provide a service to pilots but it is a service to all pilots. To achieve this we have to prioritise.
I was going into Biggin Hill one day in an Aztec on a charter, the radio calls went something like this as I got down towards 600 feet
Twr --G-CD can you orbit on final so I can get one away?
G-CD Confirm you are aware this is a public transport flight, close to max landing weight.?
Twr-- G-CD cleared to land
See, no need to say unable!