I tried them a while ago and thought they were terrible.. But I was a noob then and sample size was surely just a few hundred $ blown. Let others guide you.
Depends on your niche. I've seen some say it's great, but most say it's awful. I have yet to see someone talk up 7search much w/o using a referral link. Take that for what you want.
My personal experience was it completely rocked some zip submits I ran... for awhile. Launched early Friday and by Saturday afternoon I was wondering why I hadn't gotten into zips years ago. Monday morning I"m getting an email from the network booting me from the offer. We looked over my ads - they were fine. Keywords were fine. Only leaves one thing.
Gut says a good portion of the traffic is foreign junk even if you set USA-only and even if you get some lead gens filled out, it's fraud. Read between the lines on how they get their traffic & what I just said doesn't work and you can deduce ideas how to make 7search profitable.
Since then I've had 7search work in a few markets, but generally isn't worth the time to mess with it unless you're dialing-in on some very high-volume phrases (which I typically don't work in).
I made a lander that others said was not bad at all, I have an auto responder and I was talking with a friend who is succesful with cpa and he said my email series is good too..
Consider though you're in a niche where you're butting up against some very experienced cpa marketers. You're going to have to be extra creative on your keywords (as opposed to markets where you're going against cps marketers and big brands). Bidding on obvious bizopp keywords will not be cheap and you'll have to mentally double or triple those cpcs to account for all the fraud you'll be getting on a lead gen offer.
Go look at some sites where you'll find bizopp's promoted to broad markets and start brainstorming.
2 subscribers from 2 clicks is fantastic though. Not much to expect in conversions from them though obviously. But 0.5 cpc is quite high. Problem with 7 search, well, it's not search.... it's content network, not search with pretty high bids, cause most of that keywords located on partner websites who demand pretty high revenue for themselfs.
I tried 7search it just burned through my adspend with no conversions. Im not usre what type of traffic they are sending but it did not convert for me at all.
Not to rain on your parade but you got 21 Indian clickfraud subscribers - remember what I insinuated earlier about foreign junk traffic (clickfraud, ahem). If I was running a clickfraud ring, wouldn't I want to fill out some forms so it doesn't look like obvious clickfraud? IMO, anything lead-gen related on 7search will have rampant fraud and either damage your rep w/ a network or advertiser or at the least just waste your time.