1 dollar for one card is OK in most countries and if it is 30 dollars daily I would take the hassle and trouble to configure,troubleshoot and maintain my rigs.If it is 1 dollar for 30 RTX 4090 then it is not worth,in fact I see now in the very same website if you pay electricity it is only 0.25 dollars profit for one card and so it means 7.5 dollars for 1 day or 225 dollars monthly,well I doubt anyone except in third world countries would take the time and trouble to maintain such hot rigs for such an amount of profit monthly.
Or in a second option people who have no money but have at disposal such cards,they can do it for 225 dollars monthly and diversify such amount in buying different coins that they think have a bright future.
Single or 30 RTX 4090 it still not profitable to mine even the power cost is totally free it would take 5yrs before you get the ROI so it's a waste of time doing it for the long run unless there's a new coin that is profitable to mine or unless if you get this GPU and power for free.
Today it's not profitable but we don't know the future and maybe this coming altcoin season we can see high profit changes once altcoins are starting to be bullish not today maybe next year.
It doesn't mean you need to start mining today but wait for the upcoming altcoin season.