It depends on what exactly you mean by "worth." If you're referring to money, that can be determined quite easily.
Keep in mind, though, that what is learned in college can also be learned via determined and focused self study. At least for the most part. So you don't need college if you want to become educated, but it would probably help to a large extent.
The examples you use are probably not statistically relevant. Unless it is your goal to imply that by not going to college or by dropping out you will be the next billionaire company founder.
One thing to do is consider college value from the potential employer's perspective. Having a college degree gives employers at least some level of assurance that you made it through the basics of college level education. They would be reasonably assured that you have a fairly good understanding of math, that you can communicate well and that you have good comprehension skills. All of that is important for some jobs, but not all jobs.