Compare that to the cost of software that works perfectly, but costs 10x what it currently does in order to achieve that perfection. Think of all the free (gratis) software you use that maybe would have a huge cost associated with it to be as reliable as you would like.

It's all about tradeoffs. Everybody wants cheap software that works perfectly, but reality dictates that can't happen. Most of the time, cheap/free with minor annoyances is better than perfect but high-cost.