>>54779533ETBs are only worth buying:
1. Once if you want all the bonuses that come with them
2. If you're trying to buy from an older set where better options for bundles of a pack in a sealed product are no longer available since you should never buy just single packs from unsealed products as they may be weighed or some other shit.
3. You can't find/afford booster boxes/bundles
The best bang for your buck is almost always booster box > booster bundle > ETB > Single packs > battle stadium (though they also come with decks of cards)
Tins/collectors boxes vary wildly on how worth it they are. Some things like the Sam's Club Tyranitar/Lucario box are great deals, others like some shit target spits out are not worth it at all.