Depends on how weak the keys are. They say some were trivial, but it's possible others still had enough entropy to require a lot of brute forcing. Most 15-year-olds don't have a lot of capital to deploy.
Yeah, but this one, if he exists, does. Crack open a piggy bank, find enough money to buy safecracking tools.
Yeah.... if the first ones were trivial and acted as a proof of concept, that would generate enough money for them to invest in better servers with more distance from the actual person running it.