codster, you seem to be misunderstanding the principle of what people are trying to explain.
Advertising in /trade is a way to promote your efforts in game. This is considered fair and reasonable. If the advertisements are too repetitive or annoying, the player may be asked to stop, or banned if they do not do so.
By promoting your efforts you are more likely to be able to sell your goods. Good advertising is a good differentiator in this game, and it also rewards people who are around either for more time, or at times of heightened activity.
What you are asking for is a way to completely negate this aspect of the game. By automating these advertisements, what is to stop all of the likeminded players from following this strategy? This would not have a positive impact on the trade channel, as legitimate sellers (ones who actually put some fucking effort into doing it) would be drowned out by people like yourself who want an easy ride.
Mafia would not be a popular tool if its main use were to destroy an aspect of the game that hinges on fair usage. As of yet, no ascension tool or scripting ability can ruin anyone else's capacity to play the ascension game. In addition, the farming tools do no more than a good spreadsheet and some clever maths. Trade hinges, however, on all players having the same tools at their disposal. In short, a handicap is a good thing, provided everyone has the same one. Time is the handicap here, and this is a large part of the trading game (the more time you spend online, the better you do). If you struggle to spend as much time online as others, then tough shit. That's not a good reason to ruin everyone else's enjoyment of that aspect of the game.
As for "not being a dick". Think about it. Think about what I've tried to get across and think about how your actions would change that aspect of the game if everyone were to do it. Hell, just look in /trade and imagine every one of them were doing what you were wanting to and posting every 7 minutes. Then decide whether it is or isn't a dick move.
Tl;dr: I too will be baleeting if you go through with this. Don't.