Seems to me, the volunteers are more hard put to it, since they actually have to lose money to do this, essentially taking a pay cut from their normal careers as opposed to getting money to do it. I'm not getting your argument, or youre presenting it poorly.
The difference is that the volunteers are doing this for passion alone, the professionals are doing it for a paycheck... some may have passion, others may not, just like every single other job out there.
As for work hours... this is 2018, since the advent of the internet and VPN, there's almost no job out there that doesn't work M-F 8-6, plus overnights and weekends.
Calling it a hobby or calling it a passion matter.
"Theres a difference."
and THAT is where your condescension comes clearly into view.
Honestly I think this is a much better question. Should the BSA participate in or host a WSJ if the rules in conflict with our own G2SS.
Me - I'd say yes. The experience of a WSJ is significant enough that attending is worth the exception for these cases.
Further, the BSA should make it crystal clear to a participant from within the BSA that the rules are different. Make parents sign a document stating that they are aware of this difference.