I routinely get the gem fountain monthly. Getting 2350 gems a every 30 days for $5 is totally reasonable and easy to finance.
Then came the Research scrolls at 360 for $7 per month. While I don't need them, I could see those who do finding that reasonable as well.
However, the new Ascension shards fountain gives us 385 per 30 days for $15! Is this perhaps a typo? Given that upper tiered blueprints need at least 100 to 130 shards per star, that's only one ascended blueprint per month for $15. That seems really off balanced and over priced in comparison to the other fountains.