AIBU to think that cutting corners/costs is going to cost you more in the long run, in terms or DIY, repairs etc.
While I understand sometimes you need to do a quick emergency repair job, or funds are low etc.
When we bought our house the previous owners seemed to cut costs with DIY jobs. To the point that some were dangerous (fitting a wood burner that was found on the side of the road, the top wasn't even attached). Resulting in us paying lots for a new one to be installed properly.
Or just this week our flat roof needed work, the previous owners cut cost by just re fiberglassing over the rotten roof. Roofers said they haven't seen one that bad in a while.
I could give lots more examples. New plaster not sealed so paint peeling, bollers not fitted correctly and so on.