2. Fancy swag (that is definitely not a bribe)
3. Being wined and dined by sales people (that is definitely not a bribe)
4. Networking
5. Learn niche aspects of a programming language or framework, and prepare yourself for the future features
6. Food platters (can be hit or miss); word of advice, watch out for the fat Developers with the goatees and ponytails, or the skinny developers who dive bomb the food queue, they will clean up the buffet of the good stuff before you get there. Also duck out the presentation 5 minutes before lunchtime so you beat the queues.