If you wonder if it’s “worth” to play these mini-games go to this video:
http://www.youtube.com/watch?v=tPAQKA1qifc
Was it worth it? for me yes, AP + fun is more important than faster but repeating farming. Also I was disappointed with these skins drop rate, probably the drop rate is the same as aetherized skins.
I made video with opening pvp chests by the way:
http://www.youtube.com/watch?v=p02aq9298M4&feature=c4-overview&list=UU2PKC2T_Hr2ncy-pTkDmAFg