I've actually been thinking about running a blastr for myself as a way to make sure my events are broadcasted to every relay. I also think that we should have many blastr relays across the protocol. I only know of two right now? More could exist?
Discussion
The other issue with it is if I see your note on a relay you've blased to but are not reading from and comment on that relay you'll never see it. So clients will have to get smarter about figuring out what relays people are writing to and reading from. Gossip does some work around this