Why aren't all modern vinyl releases 45s?

I have purchased a handful of brand-new records released post CDs, and all of them are 33s, except for Baroness' Blue album, which is two LPs of 45s. The audio quality is far superior to the 33s, and there is plenty of room left on the other records (usually 2x LP) to fit the groove density required of the higher rpm. All of this makes me wonder if these bands want to go through the effort of releasing vinyl in the digital age, why not maximize quality?

Thoughts?