Before I ran Pubcon, I was an exhibit booth guy for a large computer company and a conference organizer before that. (so I am kinda biased in favor of conferences)
So much so, we exhbit at other conference 3-4 times a year. Although there are alot of benefits - the biggest benefit to exhibiting is in hearing feedback and gauging reaction to your marketing. You will find out real quick how people perceive your marketing.
>continually SOLD OUT
Or a signal of a conference with poor conference planning skills. (crunch all you want - we'll make more ;-)
> Our main marketing is through social media and word of mouth.
You can really jump start your "word of mouth" campaigns at conferences.