This is a great question. It never ever comes up during the sales process, I don't go out of the way to show them my (lack of) org chart.
If you do customization for larger customers (and you should), like boiling a frog, one day you become mission critical to their business. Once they recognize that, then they will start asking questions. Now they're kinda stuck with you. You did charge enough money, right?
At that point you must appease them with a plan. Have their code and database on a dedicated server instance. Have them pay for it and own the account (you just saved money). Make sure you're using their domain they control. Give them access to the source code. It's on the server, so that's easy. Write up a doc with how to access everything and all the frameworks and tools you use. After this, they will never bring it up again.
Worst case scenario, sell them the software outright. Price it much higher than you think they will pay. Then double that. Trust me, I've done this a few times.
If you do customization for larger customers (and you should), like boiling a frog, one day you become mission critical to their business. Once they recognize that, then they will start asking questions. Now they're kinda stuck with you. You did charge enough money, right?
At that point you must appease them with a plan. Have their code and database on a dedicated server instance. Have them pay for it and own the account (you just saved money). Make sure you're using their domain they control. Give them access to the source code. It's on the server, so that's easy. Write up a doc with how to access everything and all the frameworks and tools you use. After this, they will never bring it up again.
Worst case scenario, sell them the software outright. Price it much higher than you think they will pay. Then double that. Trust me, I've done this a few times.