* .com
* my opinion no
* it's up to you - it's your site do you think that will make you money ? have you checked out Page 1 for multiple keywords ? what do your competitors sites look like ? how much work is in it to rank well ?
* randomize
* yes - randomize
* it you were to buy $1,000 Netgear GGHH7865 Super Dooper Wireless Router for example - what would you type into Google to find out more information about it before you bought one -- those are your article titles.
It really does no good for me to write perfect answers for you because 1. your not learning anything or researching anything 2. everyone will just use the same thing and defeat the whole purpose.
Also when your building your site - every site doesn't have the exact same thing down to the keyword density - mix things up even if you use the same template once you figure out how to make it your own ..... you gotta remember we are trying to milk Google - a company with mega budget and mega employees ... be smart about it.