I think that some people are under the impression that it takes a couple of weeks of easy hobby-type fooling around to create an app like Textra. Someone working for a company to develop an app like that would probably be earning about $75k/year (or more - Cisco and Red Hat both have developers who wouldn't think twice about buying a Mercedes - for cash), so $1 for an app is actually stepping down in life. Most apps don't sell 75,000 a year. (And something tells me that Google gets a piece of that 99 cents.)
No opinion on Textra's change - I tried it, I didn't like it, so I'm still using the stock app. I don't text much, so it's not an important app to me. But if I liked it, sure I'd pay a buck for it. Anyone who smokes a pack a day burns more money than that - every day. (Don't start on how difficult it is to quit - you're talking to a former 4 pack a day smoker. I lit up, then got out of bed. If you wanted to know if I was awake, you looked for the cigarette - if I was awake I was either eating, drinking or smoking, so I'm not bad-mouthing smokers. Just saying - if you're willing to burn 2-3 dollars a day, 99 cents once isn't a big deal.)