Using my own town as a benchmark, it would work (12,000 inhabitants, with 10 courts), but I don't think it's the best benchmark since pádel is very popular here in my country (Argentina). Anyway, with some business experience, I'd say you should look at what competition your court faces. What other sports and activities are offered on the island? Padel is a very friendly sport for all ages. But if there isn't a padel culture, you have to build it, and for that, it's important to offer lessons to children and have at least a group of experienced players who play regularly and are willing to play with less experienced players. A coach who gives lessons is also essential. Organizing local tournaments it's also important, and you probably have to sell rackets and balls too... Being cheap at first could be good for lowering the entry barrier... Good luck