[100k]

Stack Overflow charges quite a bit of money for the right to search for candidates (plans range from $500 for one week access to $5000 for a year) so that should limit the number of inquiries.

Also, you can easily remove yourself from the search results.

[ig1]

In the financial sector recruiters can typically make around $50k for placing a single senior dev, paying an annual 5k fee is nothing