I must admit mav. when it comes to exotics I am very much a novice. I learnt to punt from my grandfather and he was a win only man.

I understand basic exotics but not banker tri's. That's 1 x field x field isn't it?
Wouldn't that cost an arm and a leg? How do you work out the cost for the field size? And what is this 'roving' banker I've heard of? How does that work and cost? I have seen some very good tri. pay-outs on some of my winner's
races, but never really looked into it as a gamble option.