Being a secret accomplishes several things.
1- Competitors cannot copy it. Even if they appear to you can say they left out the most important factor which is the secret part.
2- You can always claim it is superior to whatever competitors come up as your formula is based on extensive research time tested algorithyms and nobody can prove you wrong. This is similar to WAR which requires a supercomputer to calculate with different proprietary formulas depending on who is doing the calculating. I actually think Strato was only able to lower prices after taking over from TSN because of the extra leasing revenues they collect from the 3 stat services for the temporary use of HAL to calculate that voodoo.
3- Perhaps best of all nobody, even your best customer, can say your formula was misapplied and thus wrong because you can always just proclaim the discrepancy is due to the other guy not using the correct formula so of course they got a wrong answer. Your resulting rating assignments are thus by definition perfect.
No matter how much I criticize them they are not total idiots.
