I myself don't mind doing airport trips but watch up few points here:

1) prepare to wait for > 2 hours in klia for ping in uber queue no system. Some driver reported that their queue no being reset after waiting for sometimes and re-queue from behind again. Ended up >4 hours waiting time.

2) so far I never get any ping from grabcar. U better check with some of the expert grabcar driver on this.

3) some rider may want to go to seremban, nilai, cyberjaya etc rather than Kl, taman desa or pj area. The fare is only rm35 or less than rm65.00

There are some driver who return empty car to Klang valley and choose not to wait. Time is $$$.