Then when you have an ATPL offer your services for free
...only if you want to make yourself deeply unpopular. Some of us have to fly for a living, chap. How many lawyers or doctors do you know who provide their professional services 'for free'?
I realise you're still pretty young, and wish you every success. I was mad keen to fly at your age also, but there comes a time when it becomes Your Job (enjoyable as it still is), and for me flying is my sole income. Having people knocking at the door offering to do our job for nothing doesn't exactly rock my boat