I'm not sure I've ever run a vbulletin, but it seems close enough to phpbb2 & 3, which I am familiar. The ads may be placed more visibly in columns along side. A hack may even exist to give it a rolling column effect.
There's nothing wrong with the energy in this forum, I haven't done an Alexa rating, but it's a great community with great variety. However if this is the number one forum for lasers, a change never hurt. The technology is becoming more readily available, lower costs, more powerful with greater display options. Bring in enough members and the community controls who sees what. In terms of business, Joe businessman will always come to read the reviews and see the member displays before buying. Changing the placing of the ads therefore is a matter of respect and convenience for the buyer.