Yes. You might be creative, and also a good marketer.
Depends on whether a segment is outpacing other segments in popularity.
It depends on the name. For someone like me (Who is probably not capable of building an empire), keeping a nice name sounds smarter than developing it. An unspohisticated website might just give people the idea that they can get it cheap. I should park it and make some money, but I won't hire a warehouse and customer service staff.
500-600 end user. That presumes that you're willing to hold it for awhile and hopefully get it in front of the right eyes.
I think gothrose.com has some commercial potential, and I think you are right about there being more connections there. I would see it more likely to become a community site. I also think there's plenty of poetntial for it to be a brand of something like jewelry, leather, accesories, or clothes.
You have to keep in mind that an appraisal is someone's opinion of what you are likely to sell a domain for in the current market. That could be miles away from what you would actually sell it for, especially if you already have some plans.
I think it's a pretty good name to go hand reg.