"How much would it cost to do ....".
Sometimes, "off the shelf" software does not quite fit the way you run your business. Lots of you write to us and say, "your extension is great, but we need it to do xyz". Some of you ask us how much it would cost for us to make the change for you, probably hoping that the cost will be in some kind of proportion to the cost of the extension...
We are very receptive to your ideas, and they are all recorded, tracked, and prioritised in a big spreadsheet. We discuss and consider them, and in time, some of them get implemented. We need your ideas - we can't think of everything ourselves. But adding new features takes time and we can't do them all, so we try to focus on the features that will benefit the most people.
Unfortunately we cannot take on bespoke work for money. You may not realise it, but just to figure out how much to charge for a piece of work is often, in itself, a substantial piece of work. We need to understand and clarify the requirement, investigate any API's involved, make a draft design, estimate the number of hours required to code, test, document and support the solution, and then prepare a detailed contractual statement of work. That could be days of work, and of course, you expect this part to be free. And our experience has been that our quotes are always at least 10 times more than you were willing to pay.
We have wasted far too much time doing quotes for bespoke work, so now we simply say this: "We don't do bespoke work".
Yes, Joomla is free and our paid extensions cost next to nothing. But that doesn't mean our time and skills are available at low cost. If we wanted to work as paid software developers in the normal way our rates would be several hundred pounds per hour.