He could have used the same value in the hacking as the original one or even adding 1 unit to the original price. This does not cause anybody any damages and it

He could have used the same value in the hacking as the original one or even adding 1 unit to the original price. This does not cause anybody any damages and it is much easier to defend it at the court while still illegal. If there is no bug bounty program and you do not have a contract to perform such activities than it is not a good idea to engage in such activities.