At the top of that list was Coco Gauff, who won the biggest pay cheque ever given in women's tennis when she took home $4.8m (£3.7m) for winning the WTA Finals in Riyadh, Saudi Arabia, in November.

But remember, if you pay using PayPal, its purchase protection ... For this reason, these accounts do not make it on to my best buy table. Short-term bonuses are not all you need to watch out ...