I don't even know where to start with that. Using existing code libraries for common tasks means less development time/cost, higher quality code (the code has been tested by thousands of people over months or years), and easier enhancement/extension in the future (the code already solves for many common enhancements and/or is built in a modular/configurable/etc... manner and so on).
Writing your own "super-awesome-optimized-magic" ORM/Internationalization/Transaction Management/Caching/Encryption/MVC framework/XML parser/etc... is generally a bad idea for you and your client.