She's saying there's more to life than investment returns, and prize bonds give a little fun to people and also enable self employed people to avoid spending the money they put aside for their tax bill. Also says that they're a good hedge as cash (somehow).
There's also a mention of them not being like wasting money on lottery tickets. But that go me thinking. She says she has hundreds of bonds. Plucking a number out of the air, 400, and taking the price of €6.25, we can assume she has €2,500 in prize bonds. Best trad bank deposit rate I can see is 2% with AIB which would produce €33.50 net interest. Our reporter is effectively spending €33.50 annually on lottery tickets from the government (you could make this figure higher by assuming a deposit with a neo bank or through raisin, or by comparing to a different type of investment). It's not going to break the bank, but people are fooling themselves if they think it's free.