The very same people who spam the existing channels will be spamming the new extra channels additionally to the existing ones and there will be even more spam going round.
Just watch the trade or planetchannels for awhile and you will see that its the same stuff getting spammed in multiple channels....
Fully agree with the first half of your post.
I keep a trade tab with local trade, #spacetrade, and the trade channel for my local planet. oh and usually #pirate_trade or whatever that is.
When I do have multiple planet channels active I already see peopple spamming those channels with the same stuff. I, for one, am notinterested in the loot you are currently trying to sell at calypso if I'm hunting on arkadia for instance.
More trade channels, if they get any activity, will result in more spam from those same players (maybe bots) for sure. Also I don't see any need to further fragment the trading chat, for those folks that are "loyal" to one channel.
Use the channel search for the keyword "trade" and you will see that most planets already have a nice, active trade channel with over 1000 users at any given time. Trying to fragment that into general buy and sell channels will only increase the effort and spam for everyone, leaving a greater chance of missing the item you might actually be interested in.
Just my
of course.
I'm also not interested in more subscription or "premium" features but certain players seem to think it's just the greatest idea ever. Perhaps if the economy in game was doing well, or even basically functional, I would have more interest in that sort of perk.