I've had an employee ask me to "rate them" on a 1-10 scale, who've told me that if they don't get AT LEAST 8's, then they will get in trouble with their boss. SIX should me "did well". 10 should be "I can't imagine how anyone could possibly do better" (a scenario that I don't think even exists).
That sounds like a customer service survey. Employees aren't supposed to try and influence the rating in that way and depending on the industry they are likely to get into more trouble for that than they are to get a lower score because the results are sometimes used to determine reward incentives for that employee.
The way those surveys work is 2 questions are used to quantify satisfaction (with a formula beyond just high ratings) and loyalty then indexed against the industry standard and/or business history.
IME, the capability of management to cover employees who "get in trouble with the boss" is restricted to a history of actual low scores as a potential issue because management only has so much time in the day to manage employees. Response from the management side is going to vary depending on the industry, survey capture rate, and size of the business. That employee may have just been fishing for a good score or there may have been something else going on.
That was my first impression after you made the comment, anyway. This next part isn't you in particular or something I'm saying you're doing. It's a general comment.
My advice is to always fill out the surveys to the best of our knowledge. Trying to manipulate the data typically doesn't work because of the law of large numbers applying to the statistics and it's not likely that a small representation can skew the overall results, but if a person can convince a large enough representation to the same attempts as manipulating the results that skew would give incorrect data for the people interpreting the results. Skewed data to get what we want as individuals doesn't create a stronger product for everyone in general.
Filling out the numbers as we see them and writing constructive feedback with recommendations then allowing the process to complete on the designer's end is the best approach. It might not give us our individual wants but it does work for a better over-all product for the most people.
I too have seen a huge jump in investment between DMs and players, though players at least typically get the basic books. I think it goes both ways to some degree, where the people the most fascinated by the books are also more likely to eventually want to DM with them.
That's definitely my experience too. It's the DM's who spend the money on the products. In my games there's often 2 or 3 PHB's being shared around but it's the DM's and people who eventually become DM's who spend the money on more products.