There's nothing on the bottom of the saucer that would look the slightest bit like a "yacht", so that argument is moot as well.
According to Memory Alpha, Andrew Probert—you know, the only person credited for the design of the Enterprise-D
in real life—disagrees [http://en.memory-alpha.org/wiki/Captain's_yacht
]. Speaking of Mr. Probert, he's a member of the board, isn't he? Perhaps he could chime in on the issue of whether anything on the bottom of the saucer of the Enterprise-D
looks like a Captain's yacht.
Paging Mr. Probert!