This mean a new guy like me can point and s-1 or s-3 here.  The block bonus may never hit , but right now my chance of close guess would be 1 in 10 or so.
You are correct it allows older gear like the s-3 or an under volt , down clocked s-1  to have a justifiable reason to mine.
Right now there are under 10 people in the contest.
User Name-----------   Percentage
1 )philipma1957-----   27.27%
2 )dennishh----------   53.82%
3 )bctmke------------   96.3%
4 )dsppage-----------   36.33%
5 )OneInchWonder--   86.3%
6 )LASERminer------   25.25%
7 )zachmonroe------   72.8%
8 )carlsberg112-----   35.32%
So if you point a s-3 here and make a pick your chance of hitting the guess is 1 in 9
So  
LASERminer---------  25.25
philipma1957--------  27.27
carlsberg112--------- 35.32
actual number 25.56
so  Laserminer  has passed his 25.25   but  at 25.56  he is closer then  me at 27.27
so while he will need to make a change soon  he can still wait. he must do 35.25 or higher.
meanwhile someone not entered could still enter with 27.00 or 25.80  giving him the now number if a block hits now.
The guessing strategy is very cool here.