Don't tell my wife - but for specifically developing and keeping Color Match 1.0 as accurate as possible, I have probably spent close to $3000 - not including the time invested in it.  Most of that is in the addition of paints that I wouldn't have normally purchased, but there is also additional costs like the calibration targets and providing substrates for the paint samples which people offer to provide.

Each week I am spending on average another $30 on new paints which are used to confirm or correct paints that I have samples of currently in the system - as well as filling in gaps in the lines that I do not have samples for yet.

The investment of time becomes much greater.  Each paint line takes between 4 and 8 hours to prepare, scan, and input into the system.  The development of the software itself took about a month of full time work while I optimized the formulas used, developed the relational database and the user interface.  All told I have probably spent 400+ hours working on the program.

And now it is yours to use for free.