Boxtops, if you read the article, you'll SEE what Tony Blair "actually did to earn all this dosh", as you put it.
In brief, he runs a business consultancy, he is an adviser to JP Morgan - a global financial services company - and an adviser to Zürich International - a global insurance company. In addition, he is paid for delivering speeches and lectures to various bodies.
Clearly such companies, societies and organisations would not pay for these services if they did not value what he has to say on matters which are of interest to them.
(More of us ought to know that - post Prime-Ministership - Thatcher clawed in multi thousands as an adviser to Philip Morris Inc, the world's largest tobacco company. Her task was, apparently, to advise on how to stop EC countries bringing in anti-smoking measures.)