Great post resulting in a fair bit of debate. Myself I wouldn't feel quite right upvoting anything of my own, but I wouldn't be in favour of making a rule about it.
'Listening to self praise can be quite hard to bear
But sad to think such people are no longer rare
Self praise it is no praise some are known to say
Whilst others see self promotion as quite okay
And though love of self it is a necessary thing
You should leave it to others your praises to sing'