Talking budget decks and then quoting a budget format is misleading
The standard budget deck right now is 500$ (Izzet Lessons)
You can build Black/Red Blight Goblins for $21 or a Mono-Blue Towns deck for $20. Both play competitively.
Vivi cauldron led to a one deck standard and cost about 1000$
That's because Vivi Ornitier runs $100/ea and Agatha's Soul Cauldron runs another $130/ea. Don't build a deck where a single card is going to run you three figures. Problem solved.
It’s why formats like Pioneer are basically dead and standard is nearly on life support at local most LGS.
Well, that and the online scene cutting into the physical game's player base, sure.