If you use your alt to benefit your main at all, it is abuse. If you get caught abusing, depending on the severity and how popular you are, either nobody cares and you might get a warning (something like giving your alt a silver coin, or talking on an alt when you're silenced, or having one or two alt-adepts), or everybody notices and you get punished (past cases include mains training on alts, farming credit bonuses/coins on alts for the main, and alts giving WPs to main). There are cases where people have abused their alts, been caught and gotten away with it (includes giving WPs from alts to main, holding creatures/coins on alts, creating items with alts, and using alts to reach MP6). Abuse alts at your own discretion, but if you are caught going too far, you're more likely to be punished than not. People have gotten away with some stupid things, doesn't mean you will. If you are at all worried about an action you plan to take, ask. People will be more likely to believe you when you say "I thought it was ok" if those people know you were told it was by, say, Grido.