Let me join in the hopes and pleas of others. I switched over to using Gmail for work about a year ago, I’ve been above 90% capacity for a couple of months now and I would jump at the chance to pay for more space. Why isn’t Google offering this? There’s the additional infrastructure problem that this would create, but my gut tells me this isn’t the issue. I’m guessing that giving users the option to pay for extra space in Gmail is waiting on another Google product release, like maybe their net storage product.