Is there or should there be a bundle in the market for buying all races, all classes, all items etc.
I mostly play homebrew games, and I want to unlock as much as possible to give my players as many choices in character creation as possible, but buying everything is too expensive.
So far I have paid for a few races and classes, but it takes time to single out everything I want.

If you want to buy all options, buying the Legendary Bundle is the easiast and cheapest way to go, and you will want to wait until around Thanksgiving to purchase it since that is usually when bundles go on sale. If you plan to stick around long term, the 15% off on future purchases from the Legendary Bundle will give you more bang for your buck.

In my opinion, buying everything except the compendium content is not worth it in the long run, as you will still be spending around $20 per book at the bare minimum, and for many books like TCOE, buying the whole book with the compendium content is cheaper than buying all the bundle options without the compendium content. If you have the Legendary Bundle and wait for a sale to buy things, you will be spending about $20 bucks on each new book that comes out anyways, so you might as well just save your paychecks and get the compendium content as well.