[shiroiuma]

This is unlikely. Solid gold is extremely dense, and would cause weight and balance problems on a yacht, even a large one. I have a family member who used to work at a luxury yacht-building company; they avoided even putting granite countertops and other surfaces on those craft because of the weight, even though the owners could certainly afford it. Instead, they had faux stonework painted by artists.

[blitzar]

In addition to removing the bling factor of solid platium there is also a weight saving with the solid gold toilet being 11% lighter than the platinum equivalent.

Nevertheless, weight and balance can be an issue this is why you need to have a yacht extension to increase length (and occasionally girth - you have to use the swedish pumps for that one). In addition you need to buy multiple solid gold toilets for all the bathrooms, plus a couple extra to use as balast to get the correct balance.