I like the direction of the idea... it will being at least more thoughts into attention.
Rebloggers could also receive different scores to set them apart even more from farmers/bots over time that could be included in the equation.
Yep, this could be easily done via a random distance from the post curation time. Let's say, if you last 10 reblogs are within a X% variance of time since the post was created, then lower the rewards until zero.
Obviously bots can start introducing randomness into their algos, but then they are already competing with humans that can be faster then them.
There could be limits of daily reblogs, your first few being the more important ones that'll get you most of the reblog rewards while the next ones would have diminishing returns on your returns forcing you to stop reblogging more than x times if you're only doing it for the rewards, for instance.
Ideally, (in my view) would be if reblogging would have an exponential function in terms of RC cost for that particular account, (although that would require a HF most likely).
This allows your first few reblogs to be "cheap", but then if you continue with the same rate, it increases RC exponentially. Alternatively do the same with rewards, like the more you reblog, the less rewards you get (which I think is the one you mentioned). 🤣
Anyhow, the idea of gamifying attention is very interesting. I have always struggled with the value of paying for promotion. Where if almost no-one is looking there, what is the value of the "service". And followers usually are a much more competitive/efficient way of promoting. At least on HIVE...
Maybe the communities would be another great thing to think about. The cross posting could be also leveraged like the reblogs. But in this case, the mute function might need to be the higher controlling factor (in conjunction with the reblog mechanisms).