I've been to probably 15 weddings in the past 3 years and only 2 had completely hosted bars. Myself, nor anyone else, found it rude. I never thought a hosted bar was necessary. A few people had hosted cocktail hours. A few had for 2 hours. Some had until $x ran out then we paid ourselves. I've literally seen more cash bars than anything else. The first time I went to an open bar wedding I was shocked, actually! Is this a circle thing? Is it a location thing? I've read every single person say that a cash bar is never an option but the fact is that more people than not do cash bars and no one is ever offended. I go to a wedding to celebrate the couple.. Not to be thanked for going.
Side note: FH and I are completely hosting all 300 people. In all honesty though, if it wasn't for an amazing deal from the hotel for such a large wedding we wouldn't have been able to do it. And people would have much rather paid for their own drinks rather than having a dry wedding.