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I wouldn't be surprised if BH's are more common than we may think. If we look at it simply, they are nothing more than gargantuan stars, remnant cores or otherwise.
If memory serves me right, most BH's are small, unstable and short lived. They could well have been a lot more common earlier in the Universe' history when super massive stars were much more common too due to the higher density of matter, etc.
Are there not also super massive stars that are invisible to our eyes as they glow in the UV spectrum they are so hot? I could be mistaken here though.
These two BH's interplay should provide for very interesting study.
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