Hi Bianca

My 2 cents worth.

In a typical year - it takes 5-7kg of olives to make a litre of  oil, depending on the mill and the method. It will cost you approximately €1 per litre to have it made into oil. 

Most oil mills require that you bring in a minimum of 400/500 kg per pressing.

We have sold our oil in the UK for between £10 and £15 per litre, but transport can be another £2 per litre, averaged out.

If you sell your olives to the co-operativa you will receive between 25c and 35c per kilo.

It is nice work picking olives for oil and the end product is great - so great in fact that now we just make oil for ourselves, and give away a little to friends. We press our oil using the old method - stone ground and cold pressed. There is nothing to compare with in the UK market.

Hope that helps