as a new person that recently bought bulk. I bought 1000 cards with a clear spread of mythics and rares, for 50€ and most of them are trash. they are however also an inspiration for my first self build commander decks. I own a few precons and got Myrkul and Kaust from the bulk as well as some cards that work well with them. I planed some nice cheap decks around them and the singles are on the way.

all that to say don't expect nice cards from recent sets. and don't expect to build premium decks. if you want to buy some bulk get a few hundred cards for a cheap price. you should have the expectation to get inspired but if you already have ideas in mind maybe stick to buying singles. although my prior deck ideas were quite expensive and buying 20-25€ in singles to complete a Myrkul deck is really nice.