Once my debts from University were paid off I began paying into a Mini-Cash ISA as it gives a decent rate of interest (5%) and the returns are tax free.
However, 5% per year does not seem like a very good return to me, so I started to look at other ways to increase my return.
Betting on football matches would seem to be a much worse idea than keeping my money safe with a bank, however the returns are larger, if you get the predictions right!
So the ideal situation would be to get a better return than an ISA while only betting on matches which you can be certain of the outcome.
Of course, you cannot ever be certain of a football result, but this can be countered by betting on lots of matches getting them right almost all of the time.