#1 this should be in meta (its reported, I suspect it will be moved soon)
#2
https://bitcointalk.org/index.php?topic=703657.0while there is no official set of rules, this might give you a hint. If not you might want to post there to improve it, since its still in the works and questions like yours get asked a lot.
#3 its not about the number of words, but whether you contribute to the discussion or not. Most of your posts are 1-liners. Those might get the point across as in: you stated your opinion. That however is not contributing toward any healthy discussion.
E.g. this one:
I don't think it's as clear cut as a simple yes or no, it would depend on the business

You could have writen at least a few more sentences on what factors it would depend in your opinion. What do you think would be a point for a bussiness to accept bitcoin and what (do you think) would be a point not to accept bitcoin. Like this its just an opinion and since we dont know you, it alone has not much value.
All of these posts are no problem btw if you do not sell your signature. You are getting paid for each post, thus the mods assume that you are more likely to post something just because you get paid for it. If thats not true and the way you post is just the way you post, stop selling your signature and I am sure you will have no more problems.
I too had my account banned for this very reason. My room-mate (nwfella) went through several of my posts and identified the ones that he considered 'fluff' and after he explained it too me it sort of made sense. Sure didn't like being banned that's for sure but now I know and as they say knowing is half the battle.
BTW, it would've been nice if I would've received some sort of warning before-hand that my posts where seeming inconsequential but I guess that would probably be nearly impossible to fully automate given that the posts have to be gone through by a real live person.