I am from a developing country (Bangladesh) and use a pirated version of Windows (because you cannot buy the genuine one at stores). If I wasn't a web developer I would probably be using Windows XP and IE6 (easier to crack).

I regularly pay for stuff on the internet (domains, hosting, invoicing apps, ios apps, etc. etc.) as long as Paypal is supported (we cannot use credit cards to make international payments).

You need to support as many people as possible with your webapp, you never know who your customer is.