I myself have two disability insurance policies. The first one I took out relatively young (somewhere between 20 and 23). It is combined with a life insurance. If I would do the combination again now - I don’t think so. Positive about it: The life insurance has a guaranteed interest rate of > 4%. A disadvantage of the old insurance is the abstract referenceability, which was standard back then.
When it came to building the house, I took out an additional risk disability insurance because the coverage of the old disability insurance would not have even covered the mortgage payment.
Just for fun, I calculated online. To insure 75% of my net income, I (born 1972) pay over 2,000 per year (with the cheapest offers - no idea which benefit components might be missing)! For only insuring 1,000 € per month, I don’t need the insurance - that would not get me far in case of emergency.
I also made an online comparison with your age just for fun. Since I don’t know how high 75% of your net income is, I simply insured 2,000 (100% salaried office worker, non-smoker, bachelor’s degree from a university of applied sciences [no idea if that’s correct]). It comes to 780 euros. The only thing that probably lowered the price a bit is that I limited the term to the 63rd year of life. Then, as far as I know, you can enter the regular retirement pension. At an end age of 65, it would cost you 955 euros.
So either you really earn a lot , or you have a number of risk factors included (which, as far as I know, cannot be entered in an online calculator, e.g. health). But I only named the cheapest insurance now and did not look at clauses.