Its 3rd time I did a graphical designing job for free of cost. People ask about a lot of work to do but first to finish a single unit of work as trial (sample) to see if they could continue to work with. After I supply doing it, they skip away. It seems they didn’t wanted lot of work to do but originally they just wanted to finish a single thing (e.g. a banner, logo or card) and it was given to them free of cost.
I want to know how to deal with such clients. Thank you!