I think the problem is that the devs are experts in Java and programing languages, but not in Excel. Excel has a learning curve much higher than WORD.
Actually we have quite a detailed model in Excel since 21th thanks to Bitseed, however we decided to use it for internal reference only, as it does not include Maxmint data (which could be sent from same BTC address multiple times), not provides interactive marking of accounts to be refunded, nor provides any search facility via Bter ID while still preserving the ID's privacy.
Unfortunately, programming the formula and running with it over the whole data-set, has proven to be somewhat more time consuming than expected.
For sure!! I could see how much time this would take.. publicly viewable.. privately searchable.. floating percentages... It's not just a spreadsheet..