You do not deserve a tip for takeout
This post is mentioned every now and then, and now it's my turn to use the Xbox.
If I come to your business and get takeout, or the entire structure of your business is takeaway — an increasingly common business model that we should actively support to lower overhead costs for new businesses — you will not be getting a tip.
Apparently many people who work in the GTA don't seem to understand that tips fall under "gratuity" and not service charges, meaning that they are completely optional. This means that, as someone who is working at a business, you should never expect gratuity to be part of your earnings.
That you believe that you are owed more than 15% of every purchase is something I strongly file away under "that's a you problem". I'm not sure why you think this is income you are owed, but I think you need to reevaluate your circumstances if this is something you're relying on. Either it's time to talk to your boss about a raise, or maybe it's time to do some introspection and realize that you want more out of life.
You can pout, give me a dirty look, or even choose active aggression, but I'm not going to fold and give you more of my very limited income out of guilt. In fact, I probably won't return to your business and warn others I know that this is what they can expect. Not a very wise tactic for the business in the long-run, is it?
If you have the opportunity, I invite you to take a trip to East Asia and evaluate the business model there. Rather than annoying your customers for a couple of extra bucks, the strategy is to get more customers and sell more. And guess what? It actually works really well and builds loyalty and a steady flow of customers. It occasionally even increases patronage and profit margins, since people will recommend the business to others they know. Wild concept, I know.