Not me. I haven't really taken it seriously since qualifying, Octy. I only ever have one or two clients on the go at any given time. Ifn I'm honest I prefer driving the cab 'cos you're not tied to arrangements often made a week or two in advance and it's a neck down job. On the other hand, if you value job satisfaction you won't get that driving a cab but will when a student passes their test and/or sends you nice thank you cards/messages. For the moment I'll keep my options open, I guess.
It's not particularly difficult to get an ADI licence. The theory test is a piece of piss and I reckon the periodic check tests would be pretty hard to fail - although they cost €250 every two years and you have to do the hour long test which is probably going to cost you a morning or afternoon's wages as well. The hardest bit is probably the ADI driving test but passing the same will vastly improve your own driving if nothing else! The initial instruction ability test does require a bit of planning but isn't overly complex.