We pretty much charge the same for system as we do for T&F.
If you were to analyse the actual cost of a job labour wise, transport etc then you would find a marginal profit over T&F in most cases.
This is obviously down to how the jobs are managed at the beginning I guess. If your talking about overall costs including buying the systems to overall running costs then thats a bit beyond me but I think if your going to go with a system of some sort then you should make sure that you as a comapny can make it cost effective.
From my point of view, I would ditch the haki, except the roofing system and loading bays and stick with cuplock, purely as we have mountains of cuplock and all the haki extras are too expensive.
From a day to day basis you would really need to work out whats more cost effective for each application.
My boss is a major systems fan and tries to apply it to nearly everything, so I have to try and point out where it can work to our benefit and where we would be better off going T&F.
Dave.