Agreed Ian, to a certain degree, but lots of people don't want to publicly state what they have spent, for many reasons. But the biggest one being that you make it a target for getting nicked if it's got lots of expensive shiny things underneath that can be stripped out.
Again, it's the kind of thing that people could PM someone for. Or we could start a list of general mods and costs in a separate thread, so in a roundabout way, yours is not a bad shout at all. It could List general costs for Filters, exhausts, mapping, FMIC, turbos etc.