500 a month for 3k there is no way. I have been using 2 computers I got for 2500 each. One had a 3090 and the other as a 3080. It was cheaper than buying marked-up cards and I've made over 1.3 ETH in a span of 8 months. The best way to really do this is to mine as much as you can and then sell the cards before the prices drop too much. NVIDA is coming out with new cards that are priced 3200-4,500.This will only drive up the demand of the cards now that are already being sold 2x more than msrp to at least 3x as much.
I started to buy my minging rig stuff a few months ago. I have 2 3090s, 2 3060tis, 1080, open-air rack, case fans, mining motherboard, hard drive, ram, and a cpu just sitting here. Finally came to the conclusion last night with the wife that my apartment won't handle the noise along with a 2-year-old wanting to wreck everything. The joy of living in an apartment in Los Angeles for the price of a mansion in another state. Fucking makes me sick. So now I need to figure out how to sell all this stuff.
I think Eth will be back up to 4500 and at some point be worth 10k. If ETH is at 4500 You would be making 1,285 (.29 ETH)per month with (3) 3090s, (1) 3080, (2) 3060 TIs, (1) 1080. At the end of the day it doesn't matter if it's worth 10 dollars now and 10,000 in 2 years. If you make the 3.5 ETH from this setup in 12 months and sit on it, it'll be worth more than the rig and plus you can sell the rig. Or you can just mine the other coins out there and still sell the cards for a profit.
Use this.
Calculate the mining rewards for cryptocurrencies mined using video cards (GPU’s). Best coins to mine with your GPU.
2cryptocalc.com