For the small ads that appear on top (Ads by Google), why don’t you encourage them to participate with a C2 system? I had conversations with a couple of them (including Tradertech), and it is hard as a reader to come into C2, and have an interest in (or take seriously) advertised systems that don’t follow the c2 philosophy…
You need to reverse the question. Why don’t they subscribe to collective2. What do you think yourself? 
if not putting your systems on C2, then why bother advertising on c2? the audience here is populated by people looking for tested results.
The whole point of C2 is a person can come here and see how a system performs under test. Spending money to advertise a system here WITHOUT having it tested seems somewhat pointless
