Unfortunately it´s a sad truth that you even have to explain yourself for not granting your vote to someone. People just expect to use a certain tag these days to receive an upvote from a community account while not even engaging with aynone on a regular basis.
Like you say people are just trying to milk any community account or service available on steem as much as possible. The greed and the bots have taken over this place within the last weeks. It´s about time that we fight back, that we stop explaining ourselves for not casting a vote and to make clear that steem is about engagement after all on top of the content.
You are correct. Many think they are entitled to being upvoted. They are angry because we only give a bunch of bucks (whilst many make only tenths of a cent on the platform)... And in exchange, they just drop posts after posts without engaging anyone else.
I don't say everyone is like that, but the majority is.
I think in that regard communities will have to make clear that a vote isn´t guaranteed at all and it won´t be explained to anyone why they didn´t receive one. People will be rewarded as soon as they create great content and engage with each other as they´ll be noticed!
We are busy with this (making things clear) at the moment. But we want to take our time.
The expression when someone successfully milks a community account.