There are less expensive ways to attend college. For example, an in-state public university should cost much less than that. And it could be even less expensive if you start at a community college and transfer there, if you live in a state and locality where the community colleges are good for transfer preparation. Note that community colleges are suitable for part time attendance, in case you want to keep running your business while you start college, or if you decide that you just want to take a course or few here and there instead of working toward a degree (which could be a possibility, since it seems like you like to self-educate, though you may find it helpful to have an instructor for some subjects).
Without any kind of academic record (or even a large number of SAT subject or AP scores that show content knowledge in typical high school subjects), some selective colleges may be hesitant to admit you. If that ends up being a problem, then the community college and transfer pathway may be your most accessible means of attending college, should you decide to do so.
In terms of the monetary return on investment, it looks like the following apply to you:
- You are motivated enough to self-educate as needed and desired.
- You are successfully self-employed.
If the above is what you want to continue doing through your career, the value of a college education and degree are rather lower for you than for most other people, who need more structure to effectively learn, and would find the degree as a credential more useful in the job market. In your line of business, do potential customers care whether you have a college degree (and if so, do major and college name matter?)?
As far as the value of making connections goes, it depends on whether your business is one where making additional connections (beyond those acquired from the normal course of doing business) is highly important or not.