Well only I and my guildmates would benefit if I get to those rare poisons spots before any other pickers. Which as a fighter possesses a potential for a great advantage of other fighters.
I think the only way to feasibly enforce any common picking law would have to be divinely inspired. Such as removing the whole poisons skillset for a time period.
Otherwise people will just continue to pick as they do now, as Ragar said.
And don't think I support the removal of any skillset, it is hard enough to even get the skills you have let alone to have them taken away for actually using them.
Belgadeth
Written by my hand on the 19th of Leaflost, in the year 1065.