I really dont understand people's issues with the build block. It is flipping useful as shit when working on big ships or even planets. Sure someone COULD abuse it by farming an entire planet, but as mentioned, the speed of a build block can be matched or near matched by a medium sized salvage ship. MEANING if someone made a massive salvage ship, they could eat a planet in a matter of minutes.
Plus, with shops having limited funds, you can't sell off, nor even physically store, all the blocks in one location. It is literally more trouble to try and manage eating up a planet then it is worth.
Don't like it, don't use it, but stop trying to screw over those that do like it.