@vimukthi :

• the amount of SP an account holds, is strongly correlated to UA, because users naturally follow wealthy accounts (they might receive rewards via commenting on high-UA users), yet people also follow "interesting accounts", let's call them "gems" (I personally right now have 246 followers including some Whales, my account is still 0 months old, yet I only have 71 Steem, but I have published 4 high-upvotes articles)
• UA is not to be seen as a stand-alone metric, nor as an anti-SPAM metric by itself. I've explained multiple times that it can me extended with other metrics. E.g.: low-UA && many posts (articles) during a longer timespan (> 30 days in a row posting) ~= spammer
• @miti might want to let the above metric serve as his "guide" to manually detect and hand-flag spammers, if he wants to combat spammers