for bitcoin related sites,namely faucet type,HYIPS,doublers ponzi,PTC etc. best networks are:
a-ads
mellowads
adalso
bitmedia
listed in my order of preference
granted majority of the traffic is from bots,one can still get some unique clicks and leads
there are many bitcoin PTP sites that provide an unexpectedly high ROI and CTR >4%
and if you run a campaign I suggest you split your funds between PTP direct ads,where users click on the links for money
and land on your page directly (more expensive)
and banner/text ad campaigns with the ad companies above
there are many more on the market,but their share is not that significant
you can also purchase direct ads with the freebie market leaders
such as freebitcoin.com etc. they work too
as for "not my kind of traffic" work harder on your targeting and ads quality,read more about marketing,test different formats