Damn good point as the tooling costs to press DVD's is pretty high and a 32GB USB stick is worth hardly anything to a company Beths size, but they would still probably use the same lame excuse "Pirates" as if that's really going to stop someone out there finding ways of making illegal copies.
No point in saying "get pissed off with your service provider" if that's all they can provide you with, maybe there is no ADSL, or you have to use Mobile Broadband which is very restrictive, all Internet users cannot get the same blinding speeds and huge download usage as those in cities and other higher populated areas. Those stuck out in more rural areas only get what they are given and pay a hell of a lot more money for way less of a service, so those people should then be penalised by buying what was advertised as a DVD purchase with no mention on the box you needed to be able to download 20GB. BTW I'm no longer in that rubbish situation but if I could buy a full DVD version instead of a Steam download I damn well would.