you are not alone.
I once bought a John Deere LX188 mower. Sweet little riding mower, loved everything about it and I mean everything. Silky smooth running, quiet, comfortable, but a little slow. Big deal. More time to have a glass of tea.
Anyway I gave $400 for the mower and it looked brand new. The transmission pulley was shot, replaced it and used it for a while. Then one afternoon my brother wanted to ride the 4 wheeler and I kept the mower parked behind the 4 wheeler in the summer since the ATV never really moved til about August, but the mower got used every 3-4 days from April through late August, then about once a week from Aug-Nov. So he gets on my mower, backs it out and hung the side of the storage building with the hood, broke the hood. Ok big deal I'll fix it (soldering gun). That lasted exactly one cycle of opening the hood to check the oil, then it just shattered, cracked all over the place. Great I get to buy a new hood and of course it wasn't just the lower part, it was also the upper that cracked. So I called Deere dealer locally (actually worked there & was able to get a little break on the parts). $900 for all the pieces. For a $450 lawn mower. Well the rest of the mower looked literally brand new, so I bought & sold a bunch of, well, junk (yard sale stuff, storage unit contents, etc) and saved up the money. Ended up buying one off of Ebay, every single part including the headlights, harness, bulbs, screws, nuts, decals, sponges, everything-for a little less than dealer wanted, and it all came as a "kit" (not a "Deere" kit, but it was all Deere parts thrown together as one order). A few hours after receipt, I had it back going again. Sold it a few weeks later for $1700, didn't want to but a guy seen me mowing the grass at the house & offered me $1700 for it. Mind you, almost $800 JUST FOR THE GREEN HOOD. It is so common that some of the eBay sellers offer the hood as a 'kit' just the way I got it, all genuine deere parts but all put together as one order. I have rarely seen a Deere LX series mower that didn't have a broken hood, that's how bad they were and still are, though the LX series is long gone now (replaced by the X series I think)--and my neighbor's got an X330 I think it is, and yes you guessed it, busted hood. little over a year old now, he got it for Christmas 2018. I didn't bother asking how much. He's a die hard Deere guy and very proud of his green broken hood. Google search "john deere plastic hood broken". They are famous for it.
Remember, there's an engine thingy under that big green plastic (actually polycarbonate) hood, and the PC gets brittle with age, temperature, cold, oxidation, basically anything that doesn't run down the perfectly manicured roads with no vibration and stored in a climate controlled room, and removed when hot, will cause it to crack at some point, guaranteed! So yes, PC is the absolute wrong material to use for a tractor or mower hood. Basically the perfect example of what NOT to use, if you will.
Kubota did have a fun of a few broken hoods and fenders on the bx's and they were replacing them for a while. Now all of the BX's are metal, which they (IMO) should've been all along. They were just trying to compete with other brands and competing sometimes means cutting a cost somewhere to keep the price down, and it just happened to be the hood & fender assembly on some of the BX's for a year or two. I used to do service management and filed a lot of goodwill claims where someone thought a machine that was 5 or 6 years OUT of warranty should get it paid for (Lifetime warranty??). I mean lots of them, and I didn't mind doing it for most folks. There were a couple exceptions that come to mind but that's a different subject. So Kubota was buying hoods and fenders for bx's that were several years old, on goodwill, and at 100% reimbursement. That cow dried up, due to the age of that particular generation of BX's, which are now closing in on 10 years old. It is, IMO, unfortunate, that they chose to use PC for a hood, like Deere did and still does, and it's very unfortunate that it costs a lot of money to replace. Now, there is a very (and I mean VERY) remote possibility that a dealer that you really like might get you some help with the cost of it....BUT keep in mind that "goodwill" is likely going to be a shared cost, meaning you'd be buying 2/3 of the hood (used as an example) where Kubota might only put up 1/3 of it.