Thanks for asking, Eric - at this point, it's a "known Known" and is unlikely to be changed, barring Google dropping the entire Groups format.
Despite drawbacks and quirks, it provides decent bandwidth with a minimum of management and zero out of pocket cost. I've hosted, managed and run Listservs, BBS's and their related offspring over the years and none of them are without hassle.
The attachment size for photos into Google Groups has been 25 MB for some time now. Yeah... but the other option is to set up a nice photo album and share that link.
I have posted before that if things are not working correctly, the one helpful "to-do" is to access the Settings panel and use the "Send feedback to Google" button. Some things have actually been addressed over the years.
There is a "For Sale" tag (Or "Label" in Googroup parlance). Periodically I remind folks, but honestly, almost every list member seems to label things clearly enough in the subject that it's hard to be confused.
There are actually three labels - "RBW-Emphemera" - "RBW-History" and "transations-sell-buy-trade"
I"ve been relatively slow to implement them, as I did not want to impose too much structure on this group.
I would also say that basic searchability is pretty strong - that's been refined a great deal over the last couple years. As with Gmail, it uses tools which are pretty refined.
There's another one which I'm not an admin of called "Rivendellicious" which also includes Bridgestone topics and allows transactions.
again, I appreciate your input - thanks!
- Jim / group admin