Why are there fixed corridors for the usages of productions?

Why are there fixed corridors for the usages of productions?

The GVL formats mentioned here count among the smaller sub-budgets which make up less than 3 percent of the total distribution sum for performers per usage year. In the interest of a timely release of reserves in favour of the rights holders, the boards of GVL, in agreement with the DPMA, have decided to distribute the full remuneration for the "Radio/TV extra formats" (formerly "Open Budgets") in a simplified procedure.

For this reason, "corridors" were established, which both limit the time frame and define the frequency of broadcasts in different ranges "from - to". This means that your participation is not remunerated with an exact amount of broadcasts, as in the regular distributions, but is assigned to a corridor that fits the sub-budget and is considered on a flat-rate basis.