Let’s count the ways:
(2) If that hardware fails, you are out in the cold.
(3) Someone has to maintain that hardware. In house IT labor is expensive.
(4) If you need more capacity, you have to ramp up at a tiered level, which means you may need to buy capacity you don’t presently need
(5) All of that hardware runs on software, which costs money
(6) All of that software needs to be installed, updated, etc. (see # 3)
(7) All of that hardware and software has to run 24/7. Are you large enough to pay for in house monitoring and support 24/7? (See again #3)
(8) All of that data has to be protected with security software, which means skilled IT support and expensive virus protection