It's all one big connected market with hashpower. No (established) coin will be significantly more profitable than others. If it is, miners will switch to that coin, difficulty increases and profit goes down until it reaches equilibrium with other coins. Much of this happens automatically today due to profit switching software and large services like Nicehash.
ASICS however are not equal in this connected market because they can only do one thing. So when Monero forked, they took all that hashpower off the market. (There are still some coins for them but soon there will not be.) This result