Well aware of contention ratios. That's the gamble the ISP makes. Now they're trying to pass the risk onto the consumer. That shouldn't be the consumer's problem. That problem also doesn't quite relate to a data cap. Contention ratios are entirely dependent on bandwidth. If everyone in my neighborhood had a 250mbps connection and we all downloaded at full blast at the exact same time, sure we'd face an issue with contention ratios. The amount of data transferred doesn't matter though.