If that is the case, then the whole profit switching isn't actually working the way it's suppose to work. Just by disabling a coin shouldn't increase profits or the profit switching isn't doing it's job correctly by mining the most profitable coin.

I saw this happen at another time before the whole VERGE mining with Myriad groestl gone public.

hashrefinery.com was one of the early pools that had VERGE on Myriad groestl but it rarely mined on VERGE, even though, it was super profitable then any other coin. Once I realized that it wasn't mining correctly the most profitable coin, I mined VERGE be itself only.

So I am guessing that the YAAMP pool software tries to spread the hashrate around instead of just mining the most profitable.