Who said you didn't know us very well? I think you summed it up well. I would also mention goals. If your goal is absolute efficiency in running a convention

Who said you didn't know us very well? I think you summed it up well. I would also mention goals. If your goal is absolute efficiency in running a convention then you end up with poorly treated and underpaid workers. If your goal is making sure the convention doesn't poorly treat or underpay workers, you end up having to find someone to plug in your equipment (also I suspect there are legitimate safety and security concerns for a prototype electronics conference). You can't blame convention workers for preferring the latter situation.