You presume that one's time is free, which for many people, especially single moms, is simply not true. Time to spare is probably the single resource that they have the least of - so paying to save some time can mean a difference between being able to pull it, or simply not having a chance at all.
Cost effective use of time is also important thing. That is spending the couple hours to actually researching subject before engaging in relatively long and expensive undertaking. Maybe it is just my engineer mindset to actually first evaluate and do some basic research.
