I chose the one-time cost model for several reasons: 1) the way scientists get reimbursed from grants is difficult for recurring purchases, 2) one-time pricing

I chose the one-time cost model for several reasons: 1) the way scientists get reimbursed from grants is difficult for recurring purchases, 2) one-time pricing is easy to do and fits well with desktop software, 3) Circa is a product scientists only use occasionally, maybe a few times a year, so with a monthly model they would probably just cancel and resubscribe when they need it, which is more of a hassle for both them and me. Circa does lend itself well to desktop software because it allows saving the visualizations they are building straight to their computer instead of me trying to manage user accounts and storage in the cloud -- again, less hassle on both sides! On the topic of more expensive licensing for some customers, I forgot to mention that for commercial entities it costs $200, but that accounts only for something like 5% of sales, since it's mostly academics who want to make pretty plots for their publications.