Ok.. here we go...

1. Ethical.. well that depends on who you ask. There used to be a four post limit on steemit but that isn't there anymore as a rule. If you post too much, people may tend to overlook your posts. Some days, rare occasion, I have been known to post up to four times a day but it has been a LONG time. I usually do one, maybe two, a day. I have so many projects and curating that I do that I am limited on time to make quality posts and I will not post just to post.

2. I'm not exactly sure what you re referring to when you say their curation accounts. Do you mean curation accounts like OCD, curie, etc or if someone has their own bidbot? If you can clarify, I may be able to answer better.