I mean when 21 is the median currently, and you vote for a number beyond 21, there are no extra use when you vote far more than 21,
it's totally the same contribution whenever you vote for 21 witness or 50 witness.
only when somebody change vote from a number below 21 to a number beyond 21, or from a number beyond 21 to below 21 can change the current active witness numbers.
I didn't understand.
The 21 is the weighted median of all votes, which means it is a result but not a condition or a reason, so it doesn't make sense to say "when there are only 21 then (to change the value somehow)".
for now, there are totally about 900M BTS participate the witness vote, BEOS have 300M vote power
there are about 21 witness got more than 300M BTS support without BEOS's help.
this means when there are extra about 150M BTS(this is very close already) vote for a number more than 43, BEOS got the chance to vote for another 22 self account as the active witness, and can take over the main chain.
and if we consider those witness who get 400M BTS support without BEOS's help as a safe line, there are only 16 witness beyond this line,
this means we should keep the active witness number below 31 to ensure BEOS can't get the chance easily to set 17 self accounts as active witness.
secondly, it's a danger action to vote like this, when you or BEOS get more vote power, BEOS could take over the chain by add many self account as active witness.
True.