And they've has offered the 10600k with a $20 rebate on motherboards for months now...
$50 should come straight the case which is totally overshooting for a budget PC (I recommend the 300L here)
That leaves you with a 10 dollar difference for an CPU that competes with the i9 in gaming...
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And by the way, even the next build up chooses a 3600X over the 10600K despite the former even beating the 3700X in gaming benchmarks.
The 10600K is an insane value for gaming, and still fast enough for non-gaming tasks. Seeing as they're listing "heavy gaming" as a measurement on these builds it doesn't make any sense for at the very least the i5 to make an appearance.