To buy everything that costs Joltbux (avatar frames, backgrounds, ect.), you need 9280 Joltbux, that means you need to buy 4k joltbuxes two times and 2k jotbuxes one time, you'll get roughly 10k Joltbuxes.

Tab of E.T.C.J

LIMITED STICKER PACKS

To buy all Blobcat packs, you need 240 Joltbuxes.

To buy all El Pichon Packs, you need 440 Joltbuxes

Combining all of Sticker packs, you need 680 Joltbuxes

BACKGROUNDS

All of Blobcats backgrounds costs 220 Joltbuxes, combining all of them we will get a requirement of 1760 Joltbuxes

These 2 costs 740 Joltbuxes, combining all of them we will get a requirement of 1480 Joltbuxes

Combining all of them we will get 3240 Joltbuxes

AVATAR FRAMES

First 4 avatar frames costs 620 Joltbuxes, combining all of them we will get requirement of 2480 Joltbuxes.

Last 3 avatar frames costs 960 Joltbuxes, combining all of them we will get requirement of 2880 Joltbuxes.

Now let's combine all of numbers we've got.

680 + 3240 + 2480 + 2880 = 9280 Joltbuxes

And yes you need to spend $50 ಠ_ಠ, you should better spend on game or save money on something very important (Do not donate unless you're doing to charity)