Re: [25+PH] Kano CKPool kano.is 0.9% PPLNS US,DE,SG,JP,NL,NYA
So, @ $1016, you only get to throw 4 unused S9s in the trash instead of 5 
Can you even buy a new S9? Every time I look it's out of stock.
The only real advantage of the S9 is its resale value, which for some inexplicable reason is still very high. Although if you consider BTC exchange rate those ~4 BTC early batches don't sound so good.
Other than that both the S9 and the A7 sound like shitty investments considering recent diff jumps and Bitmain firing up its Hashnest and whatnot.