I don't think we're talking about the skill of the player joining the farm party, so much as we're lamenting the fact that someone would think that a "no sol bonus" would somehow apply to everyone BUT them. Simply put, it's rude to join such a group without at least notifying the party leader beforehand and arguing their cause to join.

The difference between a clear party and a farm party is vast. Especially when someone is wanting to do numerous runs as EFFICIENTLY as possible to try to get a particular item. Farm parties shouldn't be clearing by the skin of their teeth and wiping every third run.