Er no I've explained it wrong. What I'm saying let's suppose I had to trade Gilts. I can trade them using end of day data to calculate my position (from something like quandl.com although I haven't checked to see if they have Gilts specifically), then submit a market order during the following day. That will cost me on average £5 in slippage per contract (mid to bid/ask assuming a 1 tick = £10 spread). I'd guesstimate that I'd probably trade around 50 lots a year of Gilts, costing me £250.
Alternatively I could pay for data, in which case I'd be able to use a smart execution algo like I currently do for all the markets I trade. I know from experience that will cut my slippage by around 80% to something like £1 a lot. So I'd save 50 lots x £4 = £200. If I have to pay more than £200 for the data, then this isn't worth doing.
GAT
I see, that's an interesting way to think about it.
Have you done any testing on spot FX trading? I have seen papers with very impressive results using only carry indicators with a basket of currencies.
