The advantage to the foam filters like UNI over an OEM filter is the increased filter surface area. Plus it's a different kind of foam, so they do actually flow a bit better anyway. K&Ns are fine if you use the prefilter, but then you have no more flow than a UNI type filter and it costs 5 times as much lol
My K&N with pre-filter not only didn't
cost five times more than a comparable UNI for my 2015 Rancher, it wasn't even double the cost. A UNI for the Rancher is about $27 plus shipping from RMATV (no free shipping unless you spend $99), whereas I got my K&N w/ pre-filter for less than $50 from a different website (RMATV sadly has it for nearly $60 without pre-filter) with free shipping. Sure, the K&N was still more expensive, but I'll never, ever have to replace it. I may have to replace one or two pre-filters along the way, which are less than $10 if you shop around, but the filter itself is guaranteed for what, 1,000,000 miles?
Even foam that you can clean will eventually break apart and wear out, meaning you'll have to buy a whole other system or at least a $20 replacement. I think over the life of a machine, the K&N more than pays for itself. But that's just my experience with them. I've owned K&N filters for every machine I own that they make a filter for, and recently even switched over to their oil filters.
I'm sure you were just messing around, but five times the cost? No, not even twice the cost, and over time, I'll be willing to wager that the K&N will turn out less expensive than the UNI. Depends on machine life and all that, of course. Just my $.02.