I don't think tacky is solely the domain of the cheap lol It's really about personal preference. I find the excess of expensive weddings to sometimes be tacky in themselves as I feel we've lost sight of what a wedding is. I would find an OTT horse and carriage way more tacky than bubbles.
But that's really my point. Everyone is different. I feel we had a very classy wedding on a modest budget which suited our personalities. Tacky can happen on any amount you spend imo