If you're gonna dick them around over the difference between €0.09/GB/Month and $US0.025/GB/Month, they're probably ecstatic to not have you as a customer.

Either you're whining about their entire ecosystem of encryption, key sharing, mobile apps, desktop app, web app, etc - not being worth a cup of coffee a month "Cause I can do it all myself using S3!!!", or you're planning on storing many times more than ~200GB on their platform.