Dave, delighted you have deep enough pockets to speculate on currency but most of us don't. It's great for the very few wealthy businesses who have the cash and the foresight, but for smaller businesses it's simply impossible.
David....buying forward doesn't need to use cash. You have to predict how much dollar you need over say a 6 month period,you are given a guaranteed rate that insulates you from fluctuations over that period,but you only need to use cash when you call off what you need.
Rally Design has a rolling buy option that auto replaces what we use up to a max limit,when an exchange rate is triggered,the day before the referendum we got 1.47.
It all works very well,sometimes you lose when the pound strengthens,but at least your rate is predictable over 6 months.
Obviously you cannot buy at the moment because the rate is bad,but it's worth having the system in place when the pound recovers, the next Euro crisis will balance things out,don't forget Greece,Italy and Spain are all bankrupt countries.
Sorry if I am teaching you to suck eggs.
KudosDave