Some questions about bloodline

[Chris232]

Hello,

Can somebody help me please, I just want to ask a few things about birthright so that I can use the rules in my campaign.

It says that if a scion dies of natural causes, the bloodline goes to the land or their heir. Does this mean that scions who's fathers haven't died don't have any bloodline score, or does it increase?
If children are born with a bloodline, and the bloodline always increases after their father dies won't that result in exponential growth?

Is this how bloodtheft works?

24*5 (120 RP) Then, the target bloodline score is increased once by spending 25 points, then 26, 27, 28, 29

making the final bloodline from killing a scion of equal level 28? Doesn't that mean that gaining a great bloodline isn't very hard, it just means killing a few scions?

Since I expect my campaign to be long running, should I replace the 5x for regency with 2.5x?

If somebody usurps, does that mean they're accepted as king (unless the land deems them as unworthy?), since I am playing epic six, the king will be level six and will be able to be killed by the players. What are the implications of this?

Thanks in advance,
Chris.