just got the same experience... both with zergpool and zpool.

I did not mine for a couple months and my coins are gone. It is not a huge ammount by any stretch of the immagination but bothering me nevertheless.

they do say that they purge inactive accounts but I have the same oppinion on this as others have said: firstly 90 days is a short time AND just keeping the coins as your own is outright wrong in my oppinion. If it was a year or something along the lines I would more likely be able to understand the decision.

this is the reason why I think it is not a good place to mine.

zergpool, zpool and ahashpool all keep your coins after 90 days of inactivity.

At least ahashpool says literally that after 90 days you forfeit your coins... and not like zpool and zergpool that it is "purged".

So all in all if someone were to mine for several months and then maybe not mine for three months then all the coins are gone... not ok.

this is why I only use nicehash from now on. Had mined there for a bit and when I returned after 6 months or so, all my coins were still there and just picked up where I left.