The noise complaints are numerous. So why doesn't Spondoolies address this issue and make an alternate version in a 2U rack size? I'm sure they would sell more units if they weren't so loud.
Because the product is already obsolete and they have the SP 30 to move now. Wouldn't make sense spending the money on engineering for something that is soon to go EOL. Would be a great miner though.
August is still 2 months away. That's an eternity in BTC time. They could sell a lot of SP10 ver.2.0 in that time period. All that's needed is a bigger case with larger fans and a PSU that doesn't sound like shop-vac. Their talented engineers could probably knock that out in an afternoon.