Personally, I would prefer that the nomination cannot be from yourself, but that's not my call. And that's never going to change.
There's actually two very important reasons why we accept self nominations in the Ultimates Wildcard process.
Firstly, it opens up an avenue for people who are not necessarily part of the "in-crowds" or particularly well known - but are high achievers nonetheless. There are plenty of people over the years who have been nominated more because they have been well known or liked (for various reasons) amongst the community, but would not necessarily make the best choice as an Ultimates contender due to lack of actual gaming or hobby activity on the scene. Conversely there are many who probably don't get nominated who probably should - simply because they're not the first name that springs to mind. This allows for people who consider themselves deserving to throw their hat in the ring rather than placing themselves at the mercy of the popular vote.
Secondly, because it is often true that the people who have the best source of information about why a player is worthy to attend the Ultimates, and has a very good case to present as well as detailed knowledge of their achievements - is often the player in question themselves. I've seen HEAPS of nominations over the years that have been very "surface level" and not really made a particularly strong case - even though with a particular player's achievements or activity a much stronger case could quite easily have been made. Sometimes that player may get lucky in that the judges are much more aware of why the candidate would make a much better choice than the person making the nomination is aware of - but often this may get missed as well.
I've actually started (as of last year) keeping a file on people who have particularly impressed me throughout the year for when the Wildcards come around, so that it's not just the last couple of months activity that is looked at but rather the whole tournament season. Consistency is key - and this is what matters. Not so much where
the nomination came from (but the player still needs to be nominated!).