Developers know much more than other professions about how much SaaS products cost to run in terms of infra (i.e. very little for most products), so are much more likely to anchor on infra costs when considering whether a price is reasonable during purchasing decision than basically any other group.
Most SaaS are priced completely independently of infra costs (or any other costs really), but we are much less likely to accept products priced with high margins on top of obviously low infra costs, even though that doesn't represent nearly the full cost of running a SaaS (which consists mostly of payroll due to how high our salaries typically are haha...).
We also like to justify this line of thinking by the argument that "well, I can build this myself in an afternoon" (significantly underestimating the real ongoing time investment required to build and maintain a SaaS product, even seemingly trivial ones) or "I can write some bash scripts and put this on the VPS that I'm already running anyways" (undervaluing our own time).