Not all of those are errors... we have many processes that run many many times a day. Each time it's successful, send an email. Each time it fails, send an email, again when it retries, again when it completes. I just happen to be one of three people that get every. single. notification in the organization.
That too is not representative of a normal week. We typically do not have that many error notifications. One of the reporting guys wrote a procedure and put it as one of the first nightly procedures to run, more importantly, didn't tell anyone and made no notes, and didn't have it send failure notifications. Didn't update the table for nightly procedures, just arbitrarily stuck it in there. So, when things started failing left and right each night, it took us a long time to figure out why. We went through each procedure with a fine toothed comb, but it wasn't until we looked at the master job list did we find a job that nobody recognized.
I probably get around 20k a week. I agree, it's still stupid. The problem is that all of our software is developed in-house and the manager of the dev team, while he's wildly brilliant, has piss poor management and won't confront his employees about mistakes or poor logic.
The db admins are seen as the masters of the universe, because we fix everything that nobody else can figure out, until we have feedback... then we suddenly don't have enough knowledge on the subject. It's crazy.
It's a fantastic place to work(pay, benefits, people), if you can deal with no decision making any sense at all.