After you buy an apartment, you have to keep it clean, get it painted once in a while, repair any damages.

After you buy a car, you have to get it serviced regularly.

Even the skills that you acquire need regular practice to maintain your level of ability. 

The relationships you acquire and the acquaintances you make need regular investment of your time and generosity to keep them alive and fresh.

We often focus on the acquisition part, and not on the on-going maintenance that is needed to retain what we have acquired. 

We need to bear our maintenance costs.