Honestly, I've heard that same figure tossed around for years - 30 to 50 quality backlinks as some kind of magic threshold. But in my experience, that's more of a legacy SEO play than a realistic starting point for most of us.
What's worked far better for me is treating link building like relationship building. Instead of paying for a backlink, invest that same budget into networking with editors, podcast hosts, and industry peers on LinkedIn. A well-placed guest post or a genuine shoutout from a trusted partner can carry more weight than any purchased link - and it costs a fraction of that price.
If you're on a tight budget, I'd focus on creating something genuinely useful - a short case study, a data snapshot, or a practical template - and offer it to a few relevant publications or influencers in your niche. One strong, contextually relevant link will move the needle more than a dozen cheap ones.
you don't need to spend $500-$1,000 per link to rank. You just need to be strategic about who you invest your time in.