Twelve years ago Noel and Valerie Moran started their payments business from their kitchen table in London. They will shortly close a deal to sell the company - Prepaid Financial Services - for €327m and the couple will net around €266m.
The windfall will allow them to further pursue some of their passions, including horse racing and the restoration of an estate in Co Meath.
They always held an ambitious vision for their business but the sale of PFS to Australia's EML Payments exceeded their expectations.
Noel, who is from Navan, Co Meath, told the Sunday Independent Rich List: "When you start any new business, you obviously hope it can be fairly successful. Having said that, we didn't envisage it being as successful as it was in the finish-up."
His wife Valerie, who was born in Zimbabwe, believes that successful entrepreneurs do have a different way of looking at the world. Positivity is key.
"I think the mindset really is different because if you're going to start off thinking on the negative leg, then you really can't be an entrepreneur because that would really be doomed from the very beginning.
"What you really need to say to yourself is, I have this idea and do I think it is worth it? And if you think that idea is worth it, then you try and pursue it to make the most of it."
Getting rich quick isn't an option. Hard work goes hand-in-hand with making a business idea succeed, says Valerie.
Does that mean burning the candle at both ends?
"If you're going to be a successful entrepreneur, it's not going to happen when you are sleeping a lot," she says. "So you're going to have moments where you are working relentlessly. It's not really being a workaholic. It's realising do you want to grow or do you want to remain at a pace where you are stagnant. If you really want to grow as an entrepreneur you have to put some elbow grease in."
Has the money and success which comes with a profitable business changed them?
Says Valerie: "I think when people say you change, you change in terms of your thinking and your approach to the nature of your business and how you deal with people."
"And remember, you've got a workforce, so how you carry yourself and how you carry that business forward, is very, very important." But she adds: "We're still the same two people, we are very down to earth, easy going."
Noel says life is the same, with just a few extras.
"It won't change us, going forward. Okay, the money is important and it was important to sell for a nice number, but it was more important that we sold the business to a large entity which can take it on to another level in three or four years' time."
But, he adds: "The money has allowed us to do a couple of things that we wouldn't have been able to do 10 years ago, we hadn't got money when we set up the business."
They bought an estate in 2016 - Bective House, which sits on 180 acres overlooking the Boyne river - and they plan to restore it to turn it into a five-star hotel.
Says Noel: "My pastime is now horse racing so we are investing some money into horse racing and trying to get a stud set up in parallel."
"So those projects excite us," says Valerie. "Holidays, for example, come and go but they fizzle out. You don't have the thrill or satisfaction of saying this is what I achieved with the money that I got."
They are working on another business project, Ecomm Merchant Solutions in Navan, which provides terminals and payment solutions for retailers. They also have ambitions to sell this business and so the Morans could boost their wealth yet again.