I'd say it depends.
In order for it to be fully worth it, you need a few things:
1. A natural affinity for writing. If you don't like writing, than you aren't going to have a good time
2. A decent grasp on the English language. Typos and poor grammar will always degrade the quality of a game, especially if text is the sole content of the game.
3. Knowledge of programming, or access to a good engine. If you're making it from scratch you'll need a decent knowledge of a programming language. If you're using an engine, you need to make sure it provides you with features you need. I heard that Twine, TADS, and Tracery are good, so maybe start there.
4. An overall plan. In order to keep development smooth and consistent you'll need a plan of what you want to do. Make sure you know what content you want, what style of game play you want, and where you want your project to end up.
5. A potential audience. If nobody wants to play the game you made, than it's be an ultimately pointless experience.
If you meet all of those requirements, than I'd say it is worth it. There have been plenty of good text based games in the past like Corruption of Champions, Lilith's Throne, and Flexible Survival. Granted, both Corruption of Champions and Lilith's Throne feature custom UIs and occasional images so they don't fully count, but they'd still be fun without those.
