Nope mate, you are absolutely wrong!
If you repost an old post and make very little changes, then you can only logically expect that those who already read it simply ignore it, do not reward it and simply move on.
¿Why the heck were you going to expect that some pinhead of those who already read it or are just hunting reposts (because they have far too much useless time on their hands) was going to come and take away the "curation" incomes from all that new audience who rewarded the repost by upvoting it because they hadn't read it before, they really liked it and they thought it was valuable?
I have come across posts that I recognise as reposts because I curate in my community and read a majority of them. Most of these users who do this are just trying their luck. If it was an interesting post then at least make changes from the original and don't copy paste it.