For sure man, I am on desktop so can see your sig & I've been following your stuff in the FS/FT forum as well. It just seems like the 10900k is so... close... to the 9900K and you have one of those, it's just really incremental move. Why not put the 3090 in the spare and game on that? (100% not being critical or anything and I realize it might not be that simple)
"I have money and I don't want to" is an incredibly likely and serviceable answer as well
If only I had crpyto so I could be celebrating btc at $15k I might make some "questionable" decisions too

(or AMD stock from $3 or, or, or you get the idea.)