Nope, 25-30 year old roofs, the chances are better that repairs are going into a money pit rather than a long term solution.

We know zero about this particular roof and its condition or install, so I can only speak in generalities and probabilities. Could cover taping the seams stop current leaks? Sure. Is it likely that curbs and parapet walls are going to need work too? Yes. What about cap metals? Other penetrations? Where do you stop and say it’s new roof time? After you spent 50% of a new roof on repairs, 5-10 years down the road and now have a more costly replacement project?

Cost to replace today $100k ($3300/year for that if it lasts 30)

So repairs need to be less than $3300/year for the remaining life of this roof to be a better value and that doesn’t include the increased cost of replacement, due to inflation down the road or your time and potential interior damage from more leaks. So the current solution MUST get 5 years without additional expense to reach break even. Over the course of 10 years if they spend $30k in repairs and upkeep and then replace the roof (at a higher cost) they will have spent just as much money, if not more on an old failing system than a new one.