if you dont need to take profits from mining right away then i think its good to mine for speculation's sake ie aim for much larger potential returns by mining smaller cap coins such as hush, zencash, vert which have way more room to grow 10-100x in 1-2 years compared to eth or zec.

It's always easier to reach a market cap thats been previously hit by another coin compared to an unprecedented one.  And even if a big coin like ETH grows 10x by next year that rising tide will bring even bigger returns to the smaller cap coins provided they stay in the game that long, which i think is very likely considering the immediate mining profits of small coins are on par or even better than bigger coins.

i just think youre leaving a ton of potential gains on the table by mining larger coins where you make fractions of a coin every day. Mining is worth it when you mine 1000 bitcoins before it was worth anything and wait for it to boom. The great news is this is happening now with other coins frequently. But only if you play that game will you profit from it!