They don’t have the numbers to punish anyone.
If 20 conservatives vote against Boehner he won’t get the Speakership no matter what.
The house is on the edge of being conservative’s weapon.
Of course most likely a deal will be made with conservatives- before the Speaker election, but the conservatives will be negotiating from a position of strength.
In the Texas House a while back conservatives voted against Joe Strauss and the Democrats put him over the top. It could happen in DC too.