All I can tell you is my individual experiences.
If I buy a 40 gallon breeder tank. Spend MAYBE $30-$40 if you get a GOOD deal on a used one. New? ....$60-$100
Buy a heat pad. $20+
Buy a rheo/therm for the heat pad. $20-$100
Buy a lamp fixture. $20
Buy a rheo for the lamp fixture. $20-$50
Buy a basking lamp/ ceramic/ red bulb. Then replace that bad boy every few months. $15-$30 every two months....if not more. CHE is the best option, and they are not cheap.
Buy new, humidity-holding bedding every few months. Constantly spray the enclosure for you humidity levels.
If you do the math, and consider the long-term costs. A PVC does save you money, and initially costs nearly the same as a glass unless you REALLY try to price shop.
The only reason I continue to push them SO much is that they saved me both MONEY and a TON of time. Best investment I've ever made for my animals.
To each their own however.