It's not like using Twitter doesn't come with costs; you need to learn how to use it, you need to follow people to stay up to date, you should probably reply to

It's not like using Twitter doesn't come with costs; you need to learn how to use it, you need to follow people to stay up to date, you should probably reply to some of the people tweeting at you; and last but not least, you also need to spend time on actually coming up with things to say. That's a massive time investment. The opportunity cost of that time is a lot more than the $5 app.net used to cost per month. I assume that $5 a month is only a problem for occasional users -- but I doubt that those add a lot of value to the ecosystem (aside from higher numbers of total users signed up and other vanity metrics)