Probably the biggest reason is the 0.9% fee versus 2 or more of most other pools.  If your alternative is slushpool, you can look at the stats on the home page of minergain.com and see that for a year, kano provides an average of 0.00032379 BTC per Th / Day versus 0.00029488 (after pool fees).  If I have my math right, with 50 S9's running at 13.5Th/s, that is 79.77+BTC versus 72.65+BTC so more than 7 BTC additional with Kano.  Obviously this is historical, so this WILL be different for the next 365 days but gives you an idea.  Unfortunately I am not tracking other pools yet but probably similar.  So you can consider going to Kano the potential of a 7BTC bonus - and since random is random, it could be a fair bit higher since you would take a bigger percentage of the rewards in a 80Ph pool versus a 2.85Eh.