Yes, I read that but I just liked that approach prior to release of the new one. I have no problem paying for updates but when a developer is charging full price for an app that is a few years old while they are working on the new version that they know will be released in a month I think its kind of shady. I had Reeder before but I didn't get Readdle Calendar until it went free. I loved it, checked out the rest of their apps...bought them all and now plan to get Calendar 5 with my new phone.
I feel that by making the first version free you eliminate people that unknowingly buy it right before it becomes obsolete (which I feel is taking advantage of non-tech savvy people) & if the first version is great it will attract people that may not have wanted to buy it in the first place.