This is about balancing your mod packs to produce a rate of advancement that meets your needs. As this game is all about time and resources, the cheaper it is, the faster the advancement, and, the fewer trips (time investment) the faster the advancement. Here's the catch: Space Engineers just reached Beta, they haven't done ANY game balancing yet. Fixing the mods for balance before they balance the game would get very repetitive. In actuality, I have found that the greatest bottleneck in the game, right now, is ore processing. Even with multiple Advaned Refineries, full of modules, I'm waiting on platinum, magnesium & uranium to process. This is not, necessarily, a bad thing, but, as I said, the Devs need to make a balancing pass soon and even out the play so that advancement is more measured.