If you can get it Tim fair play, but when clients get free work up front with the intention that they will pay for work in the future , I have to say I heard it a thousand-times before, and it rarely turns out like that. Just make sure you get what you thinks worth for you time and skill. (dont mean to sound harsh)
There nothing wrong with doing free paying work, but at least make the work your own for your invented company or hypothetical client that way you can dictate the direction, design and quality.
My personally opinion its better to have a few or little paying clients and very good work then doing lots of free stuff with the hope someone going to drop you a couple of quid at some point in the future.
Yeah I see your point. The thing is, I can copyright my design, so when they intend to expand it (two e-commerce site are expanded in the future), they'd have to pay a designer lots more for a new start up than just coming to me.
Alot of the jobs are just "create me a flyer please?" kind of work.