With Plague Inc, mostly it was because I played it sooooo much back when it was on Newgrounds years and years ago. Wasn't sure if it was really worth it to buy the standalone version or not after experiencing the original so many times.
That old people game really could've been great, but the controls were whack and it wasn't as fun as advertised. Sadly. I really wanted to like that one! ☹️ It had been on my wish list for aaaages. Grabbed it immediately in the sale. And was almost immediately disappointed.