Change to a different role, or get 2 other guys and farm 50 if you're in i70 pvp and 40 if lower. You can even start a linkshell and/or use party finder to do 4v4 if you so fancy. Obviously you wont get near the practice you would get from fighting those as you would get from more experienced players but it could be something to keep in mind during an exceptionally slow day. Just remember keep up the sportsmanship in there, if you know what i mean. Its about the practice not the grind. You dont wanna be like some of those suddenly appearing r30 people with no clue in a real match, being the laughing stock, and food to, the experienced r30's.