Well ETN nanopool has same problem as all monero pools, OUTDATED shares :S every other ETN pool iv used dont give a single outdated share.
But about 500 ETN min payout, check the monero min payout, its 0,3. 500 ETN is less than a 24h work, 0,3 monero means more than 48h with 11kh/s.
none of this matters anymore , electroneum profit is dead now lol
Aslong its more profitable than any other, me thinks its far from dead

Still almost 2x better than any other with my rig. And even on nvidia, its still best coin.