RaaArtyGunner says
"Not to mention that they know that contractors/tenderer's staff are proficient in discovering deficiencies in tender documents" This is really a double edged sword......

...a number of years ago...I was tasked with preparing an enquiry specification for the hydraulic flushing of water glycol systems in our local steel industry....however an element of my task was to ensure
a rock bottom price, but No Extras could be claimed
So I diligently prepared the specification....then what happens?........

obvious collusion between 3 specialist hydraulic contractors as the all submit near identical quotations....

but at twice the estimated real cost
I was directed to withdraw the enquiry specification.......another superior

re-let a watered down version of my enquiry.....the same 3 specialist hydraulic contractors all submit near identical quotations...but at approx 1/2 of their original quotations

A contract was let...

...the work completed & then the contractor applied for & won for all sorts of extras which bought the final cost to near that of the original quotation

........Derek