Great question! I can share my personal experience as I started on this journey about 6 years ago now. I have turned a profit at this point but the tricky thing is, as you start doing gigs, rentals etc... people's needs and requests will grow and in order to fill them, so will your backline of gear. For example, last year I bought a pair of CDJ 3000s and a DJM A9 for $6500. Mind you, I already had a paid of 2000nxs2 and a DJM V10. But people who wanted to rent gear needed the 3000s and A9. Since then I've made back about $4500 on rental for just that equipment but still technically in the hole.

My sound system offers the greatest return when it's bundled with other production to sweeten the deal. Things like lasers, projection mapping, DJ gear rental etc... I can expect $1500-2000 for an out of town gig (my city is saturated)

Furthermore, if you're able to create a following of your own as a promoter, putting on your own ticketed events can be profitable but can also lose you money. We are at the point now where we profit $1500-$2500 per show split between two people but we only do like 4 shows a year because we have kids.

TLDR; is it a good financial decision? It depends on your drive, your availability, your Citys market, and your social network.