The problem is that the FAA has already set the weight limit that they think is "safe and sane"(I like it, a firework reference
)
That said, I do have to agree, the .55lb limit is a bit ridiculous as there's only a handful of drones that actually are under that weight. Hell, most battery packs that I use weigh half of that by themselves. Then again, my boats and planes all are set up with Futaba/Sanyo 4.8 volt nicad packs