system
Given the following post, respond as if you're commenting on Reddit:
human
[Mass Effect] How much does the Shadow Broker know?

I know that the Shadow Broker has agents everywhere (supposedly), but how much does the Shadow Broker know? All information has a price, even if the price may not be huge.

Can I get the insider stock tips on Elkoss Combine?

Can I get the latest EKG results of Councilor Valern?

The schematics for Eldfell-Ashland's new refinery tech?

Those are all fairly valuable info in the right (or wrong) hands, but what about lesser facts?

Is my wife cheating on me?

Am I the primary beneficiary in my brother's will?

These aren't important on a galactic scale, certainly not worth millions of credits, but they're worth SOMETHING.

Does he already have this data, or does he keep fairly little data on hand and instead acquires it as needed?
gpt
The Shadow Broker likely only knows those things that have enough value to turn a profit.  To him, her or it, information is a commodity like any other and it's only worth purchasing those secrets that offer a return on investment in credits or favors greater to the amount spent.

If knowing that your wife is cheating on you holds a monetary value greater than the price it cost to acquire that information and the Shadow Broker has both the time and interest in making a profit, then yes, they may know that.  However, if you are a person of little means, say for example a dancer at the Afterlife Club on Omega, then the price it would cost the Broker to get that information may be more expensive than what you could pay the Broker for it.

Also, secrets can have a shelf life depending on how much of a secret it is.  If your wife is cheating on you, it might be a secret to you but there are likely other's privy to that kind of information further making it a poor investment on the Broker's part.