Because if she came onto Mumsnet saying that her DH gets gifts of over £300,000 and doesn't mention it to her, I think the general consensus would either be that a man who keeps a secret like that is up to no good, or she is a troll trying to stir us all up.
\link{http://news.bbc.co.uk/1/hi/uk_politics/4769088.stm\tessa jowell enormous sum of money hubby forgot to mention story}