I think the big element you are missing is local shops and online resources. I started playing magic the gathering at the start of last year and one of the things I bought at the start was a box of 1000 cards of all varieties from eBay. It cost me $25 and was an excellent jumping off point to get started with creating decks. Especially when you compare it to the official blind packs that you are referencing that give you 15 cards for $8.

On a similar note there are dedicated platforms for buying specific cards online like TCGPlayer, Card Kingdom, and eBay of course. Your purchases aren’t always blind even from MTG itself. When you buy a preconstructed deck it’ll be a specific list of cards that are included in that.

There are also platforms specifically dedicated to building decks which admittedly takes some practice to be good at but is part of the fun. I personally use a free platform called Archidekt but there are others like Moxfield and Manabox. These platforms help with deck creation by providing suggestions and measuring cost as well as having an easy view of the overall cards chosen. Archidekt even allows you to import your collection of cards info it so you can specifically build decks only with the cards you already have. Using these websites I’ve very quickly managed to build competitive decks to play with.

Lastly the greatest element that has added significant value to Magic as a hobby has been comic book shops. These shops very often are more like nerd superstores. The ones local to me have plenty of comics and a huge catalog of cards and related accessories. You can buy the official Magic card packs but I prefer to go through their cataloged collection of loose individual cards. My local store has literally thousands of cards that are sold individually. You can go through the organized boxes for the cards you are interested in and at the end you pay for the exact cards you want. Very often the pricing for such cards is in the $0.01-$0.25 range unless it’s a card that is very coveted in play. Yes there are cards in the hundred or even thousand dollar range but those generally are of the vintage variety and are that price because of their age not their usefulness in game. These comic shops also serve as hubs for local tournaments and play which makes them great places to meet new people.

After about a year of playing I’ve probably spent about $250 on cards but I now have a collection of over 4000 cards that Archidekt values at significantly more than what I’ve paid. But that’s not the point of course. For my $250 I’ve built roughly 10 individual decks that I’ve played hundreds of games with. Long story short TCG doesn’t have to be expensive to be fun.