Why wouldn't they? A modified vega gets double what a 1080ti can net you in returns. Even if it's cryptonight/ethereum only there are these things called Exchanges where you can then convert to your coin of choice. Not sure if you've heard of them before.
In short the 1080ti can barely keep up with vega with huge price actions XD still no contest.
Except the 1080ti is better at literally everything except cryptonight. It's not even close at all when you look at hash power per Kilowatt used. How is Vega better overall? 1080ti can chase the crazy prices every week while Vega hopes cryptonight coins stay pumped up. Just like you said, difficulty caught up on the cryptonight coins. 1080ti is more flexible to allow you to mine any algonwith a hot coin.
Honestly asking to see what I'm missing here as I'm trying to decide between them right now. I'd get a Vega55 if it were 400 dollars but it seems like a tough choice when you're talking 750ish for either 1080ti or Vega56.
I don't get how the Vega is better because monero and sumo and etn have pumped, but the 1080ti isnt better because the equihash coins pumped. The Vega is awesome for crypto night and I love monero, but what happens when there are more Vegas out there in the hands of miners and are trapped mining cryptonight? Difficulty will skyrocket especially if the profitability of one of the 3 or 4 popular cryptonight coins decreases, will it not?
Today, using last 24 hours profit only, 1080ti has 15 coins over 5 dollars a day profit. Vega has 4 coins above 5 dollar per day.