Removing /ttoggle so everyone sees your ad does not do anything except force people who normally use /ttoggle to have their chat spammed. In essence, you're forcing players to pay for an audience who wants nothing to do with your ads. Removing /ttoggle does not justify a tax on trade chat because the only people interested in your ads are the people who have trade toggled on on a normal basis. Hence, the only thing you're adding is a tax for using a special chat designated for trade. On top of that, when sending trade messages in Global becomes illegal by warning, kick, temp, ect. you have created a system which punishes new players low on change for trying to start their own shops, something that we've been trying to make easier to do.
An alternative proposal is to do one of three things
1. Add a pay-per-message chat that bypasses /ttoggle
2. Implement a "gotcha" payment for users who send ads too fast, much like that of global
3. Keep chat the same as it is now.
1 would still add quite a bit of community backlash, especially from those who regularly use /ttoggle
2 would help solve the issue of players breaking the "3 duplicate messages per chat box rule"
While 3 would benefit new players who have very little meebles whenever they try to start a shop, buy, or sell items via player to player transactions. Additionally, 3 would not address the richer players to whom 100 meebles may seem insignificant as it is insignificant
On a side note, you cannot continue to promote a player to player economy while supporting policies that restrict it's growth among newer players, i.e. advertisement taxes.