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You may not Sue however, it is disingenious of you to suggest that a screen on its own is likely to attract outsiders, particularly as no one has suggested that it would. What it will provide is something for the residents of the town, the ability to promote and show local events, show major events etc. Perhaps we could use it to promote film making in local schools by say running an annual short film contest, or use it to show Blackfish productions etc. etc.
What attracts outsiders is a vibrant local economy and community with well maintained attractions at affordable prices, interesting things to see and do etc.
Does a screen give us this? No, but it can certainly be one of a range of things that could facilitate an improved town centre economy.
Does Dover actually have these things? Yes in part it does, including the Castle, Western Heights , Museum, RPH (in desperate need of TLC), Langdon Cliffs, Crabble Mill, Buckland Mill, Connaught Park, Samphire Hoe etc. What we are missing is any form of co-ordination and promotion of these things and proper funding for many of them.