Hello,
RSVP Pro requires a lot of development time. I.E. we recently moved to OmniPay Payment Library and are writing more payment plugins to improve payment library support. This has meant around 30hours of development time, a good PHP Developer earns around $75/hr so 30 x $75 would equal $2,625 just to add in this payment library if it was a private project. So a yearly renewal at $110 (which isn't really yearly as you don't need to renew yearly for it to continue working) is around 1.5hours of a developers time. I wouldn't say it is expensive really.
Yes you can just install RSVP Pro over the old one and it wouldn't overwrite the database.
Many thanks
Tony
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