I've always enjoyed drawing stuff for friends... involving myself in art trades and collaborations. And sometimes, instead of receiving fan arts, I get fan fics in return. Not that I require anything in return but when people offer their stuff quite willingly, who would refuse, eh?
Still, I always do gift arts. And not because of sappy reasons like love and friendship (only ~ChibiViki (https://www.deviantart.com/chibiviki) does that XD) but because I enjoy drawing. I give away fan arts to people around me to show them how much I appreciate their talents and to encourage them to continue doing awesome jobs. Well, not that my works are the least bit encouraging but... it