Basic strategy is to use leverage to live off dividends in retirement.
Using Vodafone (LON:VOD) VOD as an example - say it was trading at 100p/share and paying an annual dividend of about 7.5p/share, so 7.5%.
Buying shares: I've got £40000 to invest so I buy 40000 shares at 100p/share gives me an income of £3000/year.
But using a spread betting account, you buy at £1000/point which, means you need a margin of £20000 but I've got £40000 in my account so that's fine.
Buying at £1000/point give me a notional value of 100000 shares which would generate £7500/year in dividends which works out to 18.75% on my £40000.
It's not quite that good because you can't use a DFB, you got to use a Forward. The interest rate charge on a DFB is quite hight due to the base rate being high.
You use a 9 month Forward you have the cost of the spread to include every 9 months. Spread at the moment is about 1.23% to that equates to about 1.64% annually. So instead of getting 18.75% you're getting 17.11%. Sill significantly better than 7.5%.
What's even better is Vodafone (LON:VOD) VOD is currently about 84p which means, for the same margin, you can go up to £1200/point giving you about £9000/year in dividends.
Can you see a flaw?