Let me share some findings and questions about CryptoNote currencies mining comparative profitability.

The number of Bitcoins per one CryptoNight hash calculated is chosen as a profitability measure.
Here is the way to calculate it (Monero example):

Difficulty: 1102336316 (average number of hashes to find one block)
Block reward: 10.7625 XMR
Price: 0.00341429 BTC per XMR

Bitcoins per one Monero block: (Block reward) * (Price) = 10.7625 * 0.00341429 = 0.036746 BTC (per one Monero block)

Bitcoins per one hash calculated: (Bitcoins-per-one-Monero-block) / (Average-number-of-hashes-to-find-block) = 3.3335e-11 BTC per hash

The same for Bytecoin:

(48591.00 * 0.00000008) / 134552610 = 2.8890e-11 BTC per hash

or

(48591.00 * 0.00000009) / 134552610 = 3.2502e-11 BTC per hash

Looks very close to Monero level despite the fact that all the other number aren't similar at all.

The same for DarkNote:

(312.5 * 0.00000032) / 17035523 = 5.8701e-12 BTC per hash

It looks order of magnitude smaller. If you decided to skip calculations here is a chart:

http://s27.postimg.org/m7yoizif7/image.png

Several questions arise:

1st: What's wrong with XDN?

Note, that XDN in some ways is more advanced than both BCN and XMR: XDN has an embedded messaging and it has a GUI for months already.

2nd: Why BTC per hash is so close in BCN and XMR? What drives market (in the broad sense) to keep this balance?

3rd: Does this mean that miners sell all CryptoNote coins for Bitcoin (i.e. they don't keep anything)?

4th: Would the difficulty increased twice force miners to move to another chain in case of unchanged prices of both?

Here is another view on BCN/XMR price balance. Let's divide BTC-per-hash-in-BCN by BTC-per-hash-in-XMR and let's do it few times for different levels of prices of both (see table below).

One indicates the parity for a given difficulty of both networks.
>1 (blue space) - hash calculated for BCN is more expensive than hash calculated for XMR
<1 (orange space) - vice versa

http://s1.postimg.org/umuh15e33/image.png

The question is the same: what drives market to keep parity?

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PS:
For the first week of operations miners on CryptoNight.net have found 124 blocks.
Stay with us, join us and have a nice mining!