In business, you get what you pay for. Cheaper hosting might raise more issues that need to by handled by your employees, who also are expensive, and also the organization's focus gets disrupted. The hosting company / cloud vendor has an enormous economic advantage, with access to the entire hardware and software stack, the engineers who built it, people whose full-time job is operating it. Often it's cheaper to pay more for better.

As I have to explain about open source, 'Free is only free if your time is worth nothing.' (And I use a lot of FOSS, it just not always the solution.)