The point of this is not whether to share information or not....we do, it's burried in thousands of threads which requires learning the lingo, searching and reading. Paying your dues and working for the info....this weeds out the lazy and ignorant people who think it's too much of a hassle and not worth their time.....which in the long run will keep things going and hardly raise an eyebrow at a corporate level.
On the other hand there are those people who want something for nothing, read slickdeals, fatwallet, and bloggers who spoonfeed the pertinent info to greedy, ignorant masses who just want theirs. They dont care if the loophole lasts another year as long as the get thiers, and they blast it over and over until the deal dies. (think AMEX CSR point bumps and getting targeted offers matched) What works and goes unnoticed for 10,000 people will be noticed and killed when 100,000 get wind of the deal and repeat steps 1,2,3 learned on slickdeals. (Hence the term Slickdeal effect) even though the first rule is never call, the majority of people there have no finesse or self control, they usually call and ask dumb questions, draw attention to the deal, and kill it.
I found if you have to dig for answers in a forum like FT and don't have it spoonfed by some blowhard blogger, who makes money regurgitating info found here in the hopes they get more readers and in turn more ad revenue and refferal money, you are less likely to blow a deal by blabbing to anyone but trusted friends.
The question is not to share or not to share....all the info is out there.
the question is whether to spoonfeed it to the masses or save it for those willing to put in the effort to research and learn.
Once again this is all off topic, and the original topic is flawed as credit card churning basically died when Citi shut down the AA cards short churn time...partially in response to all the new people that learned about it here and exploited it. The time limits and churnability of remaing cards varies and has variables that make it impossible to make a wiki list. If your interested in getting a second bonus on a card research the threads on it and study the data points left by others, this will give you an idea but not a sure fire timetable.
Oh and there are a few good ideas that are not on these boards and are circulated through PM by established members. (don't PM me looking for info either) There are some people who don't want their goldmine opened to blabbermouth bloggers and FW and SD greedy trolls.
If too much info is shared and deals start dying then this will become the way to kill the blogs that have no original ideas....which is basically most of them.