Wherever possible I always buy a lifetime license even if it costs a multiple of single year. I look after digital for a major corp who have elected to standardise on WP and my expenses have become an admin nightmare with literally hundreds of plugins etc being processed annually. It would be nice to have a central 'plugin store' that can manage the billing and send out one invoice monthly or annually for all the plugins we use. Im not looking for a way to save money - I believe that devs should be well rewarded for their work - but the current system is a nightmare for agencies and corporates.