That is very true. Unless you are working for a highly visible technology company or high-profile corporation, most companies simply want you to keep the mess you've got going, no matter if it meas bandaids and soldering irons. Over the course of my 20 years career at four different companies, and from talking with colleagues, it is much the same story - the steering committee says, we initially invested hundreds of thousands of dollars, but we sure as hell aren't overhauling and starting over.
The best boss I ever had did what I now refer to as guerrilla network administration. We had an aging infrastructure supporting hundreds of banks that we wanted to migrate off Wintel based systems, because they were end of lifing and we were sick of holding it together with bandaids and baling wire. It kept breaking, we sysadmins were sick of sitting through post-mortem meetings, and we were sick of upper management's refusal to acknowledge that it wasn't that the sysadmins sucked, it was that we didn't have a magic wand to keep the old nag on its feet to pull the plow. We repeatedly added a new plan into the budget to change out the system, and just as repeatedly got turned down because of cost.
One day we had what was a near catastrophic hardware failure on one of those systems and we had to wait three days to get the parts on it because no one supported it any more. My boss told us to let it sit, and we did, chewing Tums the whole time because it's not like he was the one who would get fired over it. When upper management asked why we were still down after 24 hours, he took a PO in to them and said that when they signed off on new and functional systems, the problem would be fixed. When they balked, he asked them was the cost of a new system really so exorbitant compared to the manhours and effort it took to nurse a sick system well beyond its years.
They signed, we had it changed out in two months, and we went another four years without so much as a hiccup. If he hadn't moved out of state I would have followed that man anywhere.