Can't really value mine - the winter hack was built up from a no brand frame with bits and pieces, the summer bike I'm currrently on, the FCR, was bought second hand from work, I think I paid about £100 for it, but it's got new wheels and handlebars and an added rack and stuff. The Galaxy is just back from a powdercoating, and cost me £15 in an auction about 9 years ago. Any of them might be used for day to day stuff depending on season and mood.
They all have sentimental value way above any monetary value.