Comment by bonki

I explained in another comment why it isn't throwing money out of the window. In my experience, it often costs a lot more money in the long run to not do it. The underlying problem is that most companies don't really think mid- or long-term and are happy with chasing fast money and eventually throwing it all away anyway because the product isn't competitive anymore and/or maintenance becomes too expensive. These are problems which definitely can be mitigated, but it requires a good team.