I have an account I use for delegating to people and projects. It only has about 25 active HP. I use to get curation rewards before the last hard fork, not many but some. Since then I think the curation reward change effects voting in that if you vote in the first day you get what your vote value is regardless of time voting in that first 24 hours. So if you do not vote above dust level you may not be getting any curation reward at all. I am not sure that is how it works or not, but it seems to be the way it is.