I forgot to add something important.
I will give the example with ACR.
There, they have re-entry tourneys, rebuy tourneys, and re-entry tourneys with extended rebuy-only period.
This distinguishment is VERY important.
Because it defines the way prize money is distributed. And hence - it influences a lot the worth of late versus early registration.
In re-entry tourneys, each re-entry is counted as NEW participant. so, the player count increases, while the effectively remaining players stay the same or decrease.
And near the end of re-entry period, the in-the-money places are many compared to the remaining players.
And it is worth to register in the last minute.
In rebuy tourneys, each rebuy is NOT counted as new player. So, the in-the-money places remain few compared to the remaining players and it is NOT good to register lately.