Homeschooling limudei kodesh is a problem for most families. Assuming that both parents are Bnei Torah (the father learned in a yeshiva after high school, the mother went to seminary), the boys Torah curriculum by late middle school includes subjects that the mother can’t teach (in particular gemara). And usually the father is employed and doesn’t have adequate time.
Remember that the home schooling parent has to give up tremendous time, resulting in opportunity costs. If the mother (as it typically is) has a college degree and the option to earn somewhere between $50K and $100K (which is normal), then the cost of home school is the money she gives up by staying home.
Also remember that the goyim have well developed networks to assist parents, and we do not.
However if one is seriously “out of town” in a place with no day school, or if one wants to home school for “English” only, this probably makes it more reasonable.