The folks here who are in the travel business seem singularly unwilling to actually speak up with some facts about TA commissions, which worries me a bit - I've asked a couple of related questions and gotten zip for answers - but.... it's my understanding that the day of 5%-7% commissions is as dead as the legendary dodo bird. If I'm not being too badly smoked, your TA is going to earn between zero and $300 max from most of the OW carriers. So be nice to him/her.
I'd sure like it if someone who *knew* this stuff would correct me if I'm spreading bad rumors.