The need to clear the rights for the background advertisements, music which may be playing nearby, and even copyrighted facades and monuments kills the project.
So the low-budget film-maker doesn't exist (because of copyright). This has the knock-on effect that there is no market for reasonably priced equipment and related services.
I don't think this is a big problem in Denmark, where the only overhead is the actual costs - music playing in the background, backgrouns ads etc. are all "reasonable occurrences" here; nor in many other countries?
Is it in Belgium? Then Belgian copyright law needs to be mended (or the law that allows businesses to put up billboards anywhere needs to be mended :-)).
br Carsten