"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, but quoting for a bespoke software project 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 that part to be free.
In the early years of our business we did do some quotes for bespoke work. Our quotes were multiples of what you had in mind. Now we simply say this: "We don't do bespoke work".
Our extensions do what they do. We fix bugs for free, but we make no other commitment to meet your expectations or requirements.
Having said all that, if you are a large company willing to pay a realistic UK consultancy rate for an interesting project, maybe we can talk, but you will have to convince us that you are not thinking in terms of Joomla pricing.