Many scrum teams believe and practice sprint demo as part of sprint review meeting. Because Scrum says so. Formal demo end of sprint is a minimum requirement as per scrum guide. But it is not stopping you from doing more of so.
I strongly believe in the principle that if you see value in doing something, then do it more often like testing, frequent code commits etc.
Sprint end demo should NOT be the place where you are showcasing the product for the first time to your Product Owner(PO). You Should or Must go for more informal demos all through out the sprint. Product owner should be able to see what is being built all through out the sprint rather than just end of the sprint. Ideally if your user stories are small then you should be able to finish them after very couple of days.
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