Respectfully disagree. I have homeschooled friends who had one parent, others with two parents, and they were below poverty level. Probably far below. And others who had two parents and 8 or more siblings, yet their moms managed to homeschool them.
If a parent truly desires to homeschool, it can be done, even with no job.
Now, if two parents are both working, chances are they're working to pay a mortgage on a house they couldn't afford to buy with cash, and to pay for a loan on a car they couldn't afford to buy with cash, and to pay their credit cards they used to obtain things they couldn't afford to buy with...cash.
And those two parents probably think their house and car and stuff are higher priorities than their child's education.