Many think that the reason you present a pitch deck to investors is to get them to write a check. 

That's incorrect. 

The purpose of the startup pitch is for you (the founder of the company) to be memorable and compelling enough in your communication and deck content for investors to ask to meet with you again.

The next meeting is where the conversation will go deeper.  An investor will ask additional questions to learn more and decide if your business is something they'd consider investing in.