The orignator of this idea was shore based but with a colour printer, digital camera
and computer (plus the power to run them), a cruiser could do this for a living whilst living aboard
The guy we saw made limited run postcards of other sailors on their visiting yachts. The postcards were laid out with conventional local touristy type shots in each quarter - the name of the place just like you see on most postcards, and an oval in the centre into which a photo
of the charter
aycht, complete with crew, had been inserted.
He took such charter
yacht pictures as the yacht came into the anchorage / harbour, printed off one copy on same day, and presented it as a sample to the charterers. He then sold (and he seemed to sell them to everyone he showed them to) 10, 20, 30 cards for the equivilant of 1 euro each.
It seemed such a simple novel idea I thought it may be worth repeating here for anyone seeking a living whilst underway.