Yes, that's what I was saying, they obviously haven't updated it in awhile. And that is unprofessional and disappointing and NOT an excuse.
Of course it will go up and down, it's a crypto-currency. And there isn't much "smoothing out" to expect from crypto-currencies in the next years. Just look at ETH/ETC and Bitcoin. That's why someone of the developers should have updated the exchange rate that steemit.com uses or manually updated it. It is not that hard.

This is not about what "they should have said" it is about what they clearly stated on the front page! And a 40% difference is not covered with "approximately", 10-15% would be but 20%, 25% and 30% certainly not! And for new users who might sign up tomorrow or next week might just get 40-50 of the promised amount. That would be an even more disappointing and unprofessional way to welcome new users.

The current exchange rate is 1 Steem = $1.96. That means that 3 Steem are worth $5.88. - not $7.36! like you say.