For me I was always interested in starting up matched betting, but when I weighed up how much time I would have to spend doing it to make money, I would have been better off just working extra time at work. More money, less hassle and more enjoyable than the tedious and mind numbing nature of matched betting. If you find you have a life with plenty of time to spare and actually enjoy matched betting and are willing to jump through the hoops then go for it.
For the lazy people there are sites like mbassist, bet72 etc, which will give you matches you can use.