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Long content gives a lot of space for stuffing keywords. But don't overdo, that's a no-no. A few reliable ones are enough and consistency will be a good move.
Yeah but keyword stuffing as much as possible is a no no. You can check Search Crawler's updates because sometimes the way they rank/recognize a site differs on the update they have. Try to make relevant news/updates on the site. Not too much of KW stuffing but how you use the keyword and where...
This is a good question here, I enjoy bonuses and playing around is really fun. :) Sometimes it's a good marketing strategy, after all, the thing is how far can you go on playing. Your insight is good by the way. :)
It' a yes for me, it can still be good to get exposure on something provided that you are targeting the right market and having relevant content and using the right hashtags prior to the brand you are offering.