If you think of this from an angle of cash-on-cash return, perhaps it is easier to see the benefit and necessity of doing this.
- In your example, if a remodel cost of $25K nets an incremental $100/month increase in rent, you're looking at an annualized return of 4.8% (100*12/25000). Think of this as the baseline (lower bound) quantifiable return.
- However, it's more than that. As you alluded to, you'll most likely get better quality tenants, which leads to faster tenant fill-in, less turnover, higher chance of rent collection, etc. Actual quantifiable return of this is unknown, but you can factor that in as an upside to the baseline return above.
- Furthermore, it may decrease future expenses for the kitchen vs if a remodel is not done. Quantifiable return of this is unknown, but another upside you can add to the lower bound.
So after all that, your return is at least 4.8% annualized for this remodeling investment. Is that good vs other investment alternatives? Only you can tell.
I myself had been in this line of thinking before as well - how long does it take to get my money back. But essentially that's equivalent to asking how long does it take to double my money, which rarely helps me frame investment decisions efficiently.
One exercise I do is I imagine every spend/investment using the 1% rule. Suppose I'm spending $25K on a "house", does it net at least $250/month in "rent"? If so this will most likely "cash flow" even if I borrow money to do this (aka "mortgage"), so that's probably a good investment in any market.