I may be in the minority here, but I've received more than a few of these emails (people offering to buy me lunch to discuss an idea) and I always turn them down. Here are my reasons:<p>1) I typically go to lunch with my friends/coworkers and talk about projects we're working on together, and usually we come up with some deeper insight than we have together in meetings. I'd miss this.<p>2) My lunch time is my personal time during the day where I unwind from the morning's activities and take a break. If my brain has to "be on" for a deep conversation, I wouldn't get much of a break and might a) get tired, b) get sloppy, c) lose motivation later in the day.<p>3) Lunch is what, $20 tops? Closer to $10? My time is worth more than $10-20 for an hour's worth of conversation about someone's project. Say I have some interesting idea/insight/solution and we talk about it, and that idea/insight/solution ends up being really important to them. I ended up getting free lunch, they could end up making a bunch of money. The scales are not even.<p>I'm fully aware that other people (maybe most people?) would be excited about getting free lunch, so maybe I'm an outlier, but I thought I'd drop my two cents in.