Been there with the machine moving dilemma on a number of occasions.
Pricing includes getting to you, and getting back to base, plus the extra mileage if they are not close to you.
If you are employing someone with a HIAB, you have the choice of a 3.5 ton vehicle, or 7.5 ton upwards.
Firstly, if you have 3 x 500 kg machines, that would probably put you over the weight carrying capacity of a 3.5 ton vehicle – 3.5 ton is the gross all up weight, on average they will probably carry a payload of around 1,000 kg/1 ton max.
With a 7.5 ton upwards vehicle, all of the costs are more because of the larger vehicle.
Truth is, if you employ someone to do it for you, nobody is cheap – it is a day out for them, a probably 350 mile round trip Manchester/London/Manchester, fuel costs, wear and tear on the vehicle, having to make a profit etc.
A commercial mover will also have the costs of employee salary, employee overheads, premises etc.