Flour is a singularia tantum (no plural noun exists). So the word doesn't make sense.
It is short, although on a .net. And I cannot see much use for it commercially, other than a blog/cookery site etc as a quirky name.
Value is impossible to say. I'd be more than happy with low or mid 3 figures within a year or two, but would also be unsurprised at no sale in a few years.
It being short and quirky might bring more - one of those exceptions to the rule, but of course it's unlikely and one can't run a domain business with many of those "hopeful" names