Conferences are a dying remnant of the communication problems of the 19th century, when the only way to collaborate was to ask people to travel miles and give up large portions of their day or week.
But their organisers are tasked with making sure they are talking about the people making waves and people thus use them as a signal towards what is hot in a space. Being featured at a conference is a sign that you are one of those cutting edge people everyone is talking about.
But beware trying to buy that recognition. People know the difference between giving a talk and having a booth - the latter only signalling that you are desperate enough to be seen as one of these cutting edge people that you are prepared to pay for it.
Conferences and Exhibitions are expensive - not just in booth fees, but in management time. Just think what that 20k booth fee could do for your awareness if it was put into content marketing and social networking. And how far you would get if your top team had three days together, instead of preparing their talk and manning the booth at an exhibition.
Look at the goal - awareness - not the method. How do you best attract the attention of the savvy investor? Being part of the conference herd probably isn't it.