Nope. According to this notebook, at time of writing you have 3,081¤.
Yes, possibly modulo transaction fees (e.g. if you donate $10, and we get $9, I’m not sure if it should be 10¤ or 9¤).
It’s much cleaner to say that @Protocol Labs (the big sponsor of the CredSperiment) is offering to buy mana at a rate of $1 = 100¤. This makes it more natural to think of mana as a digital currency, replace the project arbitrarily setting a mana price with a market, and have Protocol Labs support the project by offering to be a consistent buyer of mana.
However, we should study the legal and regulatory implications of conceiving of mana in this way. I intend to write a thread elsewhere exploring this in depth.