Possible Clues:

• Be victorious in Vegas
• Make a mint, and have holiday at riverside
• It will cost more than one may think to do what some boom-time bankers did best
• Is this what board of Anglo would do at lunchtime beside the river?
• Short holiday ahead of the next type of holiday - that'll cost more than one can afford
• Cost more than can be afforded
• Win big at a casino
• Win an excessive amount, as bore might, with disastrous results