Low clearance rates for property crime are significantly because nothing is even done much of the time -- police just take a report and often won't even follow up on an obvious lead (including stuff like "find my phone says my thousand dollar phone is in that house over there").
But in any case to more directly answer your question: If the clearance rate is 15% then they have a 90% chance of being caught after ~14 crimes.
Do you mean that all the people who are installing Flock cameras now do that not because they think there is not enough surveillance but for some other reason? Like help a YC company to raise more money? Or help LEOs to stalk their exes? Or some other crazy reason mentioned in these threads?
Do you have a neighborhood social network (NextDoor and its kind)? If you do, check out reports of theft, they rarely have any surveillance and ones that have are very poor quality, usually not showing the perp enough to ID.
> But in any case to more directly answer your question: If the clearance rate is 15% then they have a 90% chance of being caught after ~14 crimes.
This does not follow. If your math had been valid we'd have to agree that hunting elk in a forest where 15% of animals are bears would result in 90% chance that every 15th elk would turn out to be a bear.