At what point it makes a financial sense to sue an IP thief?

Let's say if an employee starts an LLC and pretends to be the owner of the stolen software product (stolen proprietary source code, but few changes).

The LLC is registered in Delaware and the employee himself lives in NYC where he bought lots of real estate with sales proceeds from stolen code.

I understand you can sue anyone anytime. But it doesn't mean, you'll win or it will be worth it.

Taking completely financial aspect (no hate/hard feelings/ego stroking).

If this employee sells $100 worth of stolen software, then it's not worth suing him or is it? As the damage is not even enough to cover legal costs.

So, at what damage level does it make sense to sue this person? Can we only sue for the actual theft amount (amount invoiced out of his new LLC) or we can sue for an amount exceeding the actual theft?

At what level of theft it makes a financial sense to sue this person, taking into consideration only the legal fees, not our personal time?