The incentive offer is not necessary. A kind thought, but not necessary, especially since you already help keep the site alive with hosting and, if I remember correctly, part of the reason you did that was to make room for the online games.
I think that BSG/TLS would be harder to do though and although I haven't done any coding for Scotland Yard yet, I have been working on the flowcharts and layout design. I envision BSG/TLS needing to use some algebra for targetting that I'm familiar with but haven't used in a while so I'd rather stick with SY for now to get back into the swing of building a game system. This one is already going to be built quite a bit differently from the old Conquest game, regardless of if I get into Flash with it.