Fantasy. Enterprise sales don't happen without a dedicated sales force, politics and influence.

Fantasy. You can only code so much on your own. If it's a good idea, then because of the relatively small size of your code, people (companies, OSS groups) can easily copy it.

Just selling to enterprises is >1 person job.

Depends what "enterprise web companies" means.

Many people have sold their products or services to enterprises, working alone, or with small (< 5 or 10) teams.

This is basically impossible.

Enterprises do not buy from a single person companies and the sales cycle alone usually takes multiple people even if you could build a product that they would use by yourself.

That being said, there are several examples of single-person businesses that have gotten around the 1-2k/month price range.