[nobody3141]

Filing a patent just to have a patent is a few $100 - even less if you only file provisionally and hope the new employer doesn't understand the difference!

But if you want a patent to be of value, then it needs professional drafting and filing in multiple countries with specialist lawyers who understand for instance why Taiwan is different. That and translation and renewal fees costs $10-100K

[bostonpete]

Having a US-only patent does have value even if a corporation would often want to expand its scope after acquiring the patent.

Regardless, the objections you're raising now aren't specific to software patents. Your initial comment was that software patents are different from hardware patents because individuals don't try to sell them to companies. Individuals can (and do) acquire patents and make money by selling them to companies.