I'm running a number of vps machines on DigitalOcean, and I'm getting quite a number of shares on Ypool.
I have set up Fedora 64bit Desktop, with wine installed, running jhPrimeminer v7.1
I use -s 2000000 because mumu recommended a minimum of 2000000. The PPS goes down from when I was running -s 300000, but the number of shares it finds goes up. So PPS is not the true measurement on Ypool, only an indicator.
With this setup the PPS varies from 4500 to 5750. I have 30 of these running, and I'm getting around 12 XPM per day with these.
Until v7.1 came out the workers kept coming up as inactive, now they stay green, and rarely turn yellow.
I also have an old e-machine computer that I installed Ubuntu on, running v7.1 and it finds a share every 3 to 4 hours, not very exciting.
I have found 12 blocks so far in 10 days of mining on YPool.net.