From my playthrough so far I'd say the difficulty with rent is overspending, far into the weeks I was starting to do quite well with the money though not paying any rent I still didn't have enough for all the backpay.
I got all the care for personally managing streams and trying to purchase upgrades/paying for the courses out of my system on my first playthrough when this first released. What definitely helped the overall experience at the time was being able to rely more on some more lucrative sponsor deals prior to their rebalancing, but i was also heavily invested in everything in-game PC had to offer too, so i'd like to imagine i earned a great deal of what i had. And since i've made saves on every payment day on NTR path, i get to save the full replay treatment until much later.
When i tried both a quick new game run and continuing the save games earlier today i figured out that i could still usually ignore every cosmetic purchase (why bother with those questionable investments outside of first immersive playthroughs anyway) currently offered, do the minimal work required with the sponsors and at worst barely be able make the payment amount (or avoid the worst scenario with the help of some light last minute savescumming if needed.
All in all i'd imagine after a first few purchases on hardware/courses when the return turns out to be pretty much nothing worthwhile, people would be ignoring them (barring the situations where they accumulate too much money) and more or less comfortably roll until the end of what the game has to offer.