It is outstanding how many people still believe that there is more security working for somone else than starting up in business for yourslef. Without even realising it, most people set off on The 45 Year Plan, also now known as the Employment Trap. this is where you leave full time education, get a good job, peak at 35 and then work with no real success in income untill retirement.
Even if you manage to achieve this very ambitous plan you still eventually end up at retirement with the equivalent income that you were earning at the age of 18. This is also assuming you have a very good pension.
People are generally living longer than ever before and many of us can expect to have as much as 25+ years of retirement. A part time business is a very good way of ensuring that you can enjoy those years, especially if the business builds up a walk away residual income.