You have the right idea, but are coming at it all wrong. Look at "real world" numbers, and you will find that IQ's value is greater than you think - but is also dependent upon stats. At low levels, IQ may not be worth the 18 CP compared to another successful Touch. At higher levels, it most definitely is, just in terms of Quality alone, completely setting aside the two BB's, or Rumination.
I could illustrate that by pointing out that at level 11 with 16 Control IQ starts bumping 40 Quality Touches by one point per stack, and that at level 60 the 4th Touch on an Amphiptere Leather with 965 Control the cumulative difference between IQ and no IQ was already greater than one Basic Touch with no IQ.
