Xrumer blasting

Just looking for a bit of advice here. I have an active 2 year old forum. It gets about 4k guests and 500 members on per day

Im wondering what benefit i would see from a 10k profile blast. Ive never really used blackhat before just the odd small things

would it damage SEO?

If you want to stay careful you might want to do partial blasts.. 5k than 5k again, etc
But I doubt 2 year domain would get any attention..