Leasing is not going to make you a big player, but if the skies in Spain are too busy for your taste, it's a good way not to lose your investment.
It works only for popular kinds of plane(you won't make a fortune leasing IL62s...) but the A320 is just perfect for that. There's always a company in need. Or 10, if you don't ask too much. Though sometimes players prefer to buy them. Be sure not to sell them under value. Lease under value is annoying, sell under value is really a shame. I made the mistake quite a few times.