The wait is the key and this is what simulations shows. That wait == money for these guys. Plus as the network expands then that 1000 are less meaningful than in a smaller network etc. Security of these networks works in this way. Think like this,
- nothing you can do makes an attack impossible in a permissionless network.
- What you can do is make the attack cost (like get >50% hash power for blockchians)
- Ensure the cost of the attack is greater than the reward (i.e. the 51% attacker basically devalues the currency, so loses)
This is the way to think, some folk will then say oh a super rich … blah blah and yes that kind of attack cannot be prevented by decentralised or certralised networks, permissioned or permissionless.