Over the years sevaral small and large companies have tried to make ago at it of selling IP alone.
Most have failed or been absorbed by others.
A few continue to make it.
You need to figure out a way to protect your IP, either via encryption, or with some sort of locking method, locking it to a download cable (as Altera does), etc.
Some people sell the IP on a project by project basis, others on a royalty / chip basis.
Some include support, others sell as is, and offer extended support for a fee (like the Linux support model).
Still others make the IP free (with very basic functionality) then offer to customize it for a fee.
Some offer one price for encrypted object, and a much larger price for source.
Good luck with your efforts.
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