I didn't know it until I read an article somewhere; but styles of hard-to-change household items go through different fashions too. As an unmarried single, I'm more into Cosmo than House Beautiful, though I do sometimes watch "House Hunters" on HGTV.
Anyway, the article intimated that certain features of older houses might make them harder to sell: paneled walls, popcorn ceilings, brightly-hued shag carpets, colored bathtubs, sinks, and toilets, and so forth.
I can see how a self-respecting guy might not want to read and do his bidness while seated on a pink toilet; but light blue or green should be unobjectionable. White is, of course, preferable for the porcelain throne.
But what about brown? I can see how this might come up. Someone requests wanting something in a plain brown wrapper; but it's understood as a plain brown crapper! Anyway, I hope that they plumb enjoy the novelty.