It would seem, in order to credibly use the word, "over," the amount that follows must be a benchmark kind of number, not a specific number. Yes, specificity raises believability, generally. But it's a mistake to use the word "over" AND specificity!
How much is "over $762?" Well, if it's $763, why don't you just say THAT number?
To my way of thinking, if you're gonna use the word "over," you must use a benchmark type of number, like $750... as in: "I used it, and made over $750!"