Usually, upward of 16GB; my base monthly quota. I generally use most all of my it, sometimes going over, but try to stay under though. Here in Canada, our mobile data plans suck ass; and, overages, for the most part, are stupidly costly.
I'd be one of those people... But, I still drink a lot of coffee and pop anyhow. I really should work on eliminating, or at least minimizing, my caffeine intake... That hasn't worked out so great thus far in my life though.
While we do accept Bitcoin via BitPay, for a number of products/services that we offer, it's actually one of the least used methods of payment. For us, the most used payment method is credit card.
Not sure offhand what browsers you're having issues with, but using this SSL Certificate Checker to check www.enjen.net for example, it's indicating to update the certificate chain. Checking cdn.content-network.net, with the same checker, it's showing errors and a resolution.
While we do offer Bitcoin (via BitPay) as a payment method, it's not enabled for all products/services. However, even with those that it's available, it's not used very often. The most used payment method for us is direct CC.