rational, yes I agree that the expression of 100 is sometimes used in Talmud and Halacha as “a quantitative exaggeration made to prove the point”, such as with money: “even if pays 100 zuz…”, or in distance: “even 100 mil away…”, or by bitul: “even in 1000 it is not botel”.
However, in such examples, these is a REAL and ACTUAL difference between the lower amounts and the large amount, such as, we all agree that one zuz is worth less then 100 zuz, one mile is not as far as 100 miles, the larger amount dilutes more than a smaller amount for bitul…
But by aidus, “tray k’mayah” – two aidus are equal to 100 eidus, therefore adding a greater number HERE does not add to the weight of his hodaah.
Adaraba, it is misleading and incorrect to imply that 100 eidim give some sort of validity and greater weight as a testimonial instrument.
Hence my kasha on the expression when used in THIS particular context.