First I'd buy stat boosters to get my battle pet up to the minimum for BB entry. After that? Wearables. All the wearables.
Well, I really need to update my weapons but it's never my number one priority, so I'd definitely spend on that if I had a lot of sP. And wearables of any kind that count towards the wardrobe achievements. Probably also books for Jix.
I'd get more TC slots for Fremy and Brioche. After that, more books for Fremy!
With a "chunk o' change" like that I could easily knock out my final pet goals. Get my last pet space. Transform the few pets that I am not 100 percent in love with their current looks... spoil them rotten with minions, while adding onto my already existent minion collection. I'd basically have a ball. lol. I don't know that I could SPEND the full 500m but I'd make a solid effort in that day's time.
Weapon - singular. LOL I need a good T11 weapon and 500M at this point would suffice for one weapon. ~Kai
I'd spend it on my wishlist. I have at least 500 million sp in wishlist items that aren't gift cards, gold accounts, and custom wearable.
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Ooh! Nice!
Don't you forget about me~
First: 1. beanbags then 2. books And whatever is left probably 4. for pet stuff (a.k.a slots) and if i have anything smaller left: 3. stat boosters

I'd buy one Ornamented Hook Swords from the MC, which would give me the 1bil MC achievement prize (Blackmoons War Plate).
I'd probably then spend the remaining 50mil buying stat boosters for Elfric and see if I could get him to mid-T12 (approximately 17k in total stats).
Simple, really. I like this survey, it will be interesting to see what the results are. Lemme know if you need someone to crunch numbers for significance. xD
Wanna know more about battling? ❤️ The Official Battle Guide v3.3 ❤️ Need to find books? 🌈 The Book Grind Guide v1.0 🌈
AND
Guys
If you go and just say "from my wishlist", I'm not going to look at your wishlists and check what you have the most of.
If you tell me "wishlist stuff", at least mention the two categories of stuff you have the most on it.
In order:
i'd finally bother buying the natasha as i'd then not go below my minimum vault content of 1 bil. or maybe go HAM and actually buy a lot of the stuff i've got wishlisted, as it's built up quite a lot over the years and i'm awful at actually eventually buying stuff once the "fresh release" has worn off. also not feel bad abt spending dozens of millions on a single treasure chest item as i mainly avoid those items and find cheaper alternatives instead even if it doesn't quite capture whatever the more expensive item manages. also art. art art art.
I would probably spend all of it on stat boosters @-@
I would finish my SubQ collection (5) and then spend any remaining sP on stat boosters (3) for Crimsyn :)
If it were of no consequence to me, I'd hunt down all of the plushie and beanbags and trading cards I'm missing right now, and probably as many books as I could as well. Then I think I'd buy an Essence of Melody to finally get a Nostalgic Jollin.
After that, I'd probably cheap out and spend whatever left over I had to restock my store so that I'd continue making profit ahah;;
Needed Survival Skins
Bubble Jelly/Butterfly Bruise
Caterkiller/Clusterflux/Crackhead
Death Roe/Death Slug/Death Worms/Dolly Dreadful/Doom Bloom
Eyesore
Faceworm/Foot Rash/Freckle Fever
Gross Fungus/Grosseries
Hive Mind
Lobotomeat/Lobster Face/Love Bug/Love Sucks
Muerte Fuerte
Naughty Nip
Pinkie Patch
The Baker
Virus
With 500 mil to spend in 24 hours, it would be spent on boosters, books, and anything I could buy to resell with.
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I would go on a costume trunk shopping spree. Buy as many as I can that are missing plus a few of my favourite wigs that are way out of my price range. I'd spend the majority on wearables for me plus a couple thousand or so in wizard tokens for the next couple of token shop restocks. I'd also probably snag a couple event books and plushies/beanbags for my collection that I missed.
When I felt shopping spreed out I'd lurk on a couple of forums like the Help one for instance and buy random people things off their wishlist to gift anonymously. I used to do it way back in the day when I was bored and it's fun. Plus I'd hate to think that I spent all 500 million on just me..