There is no need to burn wavs as data-cd.
Yes, but there are situations where this can be useful. By example if data integrity is more important to you than the needed space. Besides that you don't have to mess around with offsets, etc.
@ntloser: Regular cd-players expect uncompressed
PCM data [44.1 kHz/16 Bit].
However, you could burn it in Mode1 or 2 (RAW) and a (old) stand-alone player should play it (newer ones will prevent playback, because they detect it as what it is: actually a data cd).
If you store the wave as a normal file on a CD, additional error correction data will be added while recording (besides the filesystem, etc.). A CD-player would play this data also - and this doesn't sound very well