i have signed up, to experiment a bit with setting up a pushpool

Thank you for the offer & i'll let you know how it goes

Your 50 free accounts are capable of running such a thing?
Judging by the limits in place I assume you won't be overselling the server?
We run a cloud, We essentially don't run one server. More like several hundred servers

Quantum Kiwi does not over fill cloud nodes with too many clients. We monitor all nodes very closely 24/7, high resource demand clients are moved to larger nodes to stop issues.