As audio hardware gets better and advanced audio encoding formats are developed, it is sometimes questioned whether using audio compression is still valid. Lossless MP3 formats are tested for quality. Ordinary person is hardly capable of discerning between lossless and lossy audio signals, but for a trained ear with access to high-quality audio hardware the difference is significant.
One of the arguments is that memory cards or other mobile storage devices are perfect for storing large number of audio files at hand, a feat near-impossible with Audio CDs or Vinyls.
Another issues is audio hardware. There are low-quality speakers available for cheap and there are high-quality ones that costs as much as a flat. Demand for quality audio signal raises as better-quality sound systems are available. High-quality audio hardware can only shine if the input is also of high quality - the difference simply matters. Some people claim that quality music can only be fully appreciated when it is felt with the entire body, and that means the signal must be as close to the original as possible.