Anytime I want to make a call, I don't bother carrying the phone close to my ear to know if it's ringing at the other end or to know when the person I'm calling has picked. I just hold it at the normal distance from my eye and look at the screen.. ofcourse, it indicates on the screen when it is ringing at the other end and when it has been picked..such that if the other party had a caller tune, I didn't get to listen to it (mind you, my phone was not on loudspeaker).
I also discover that many other people out there (probably the majority) apply this pattern..

In such a case as this, is it still reasonable to subscribe to using a caller tune at a cost of, maybe, N50 or more? as people won't get to listen to the tune afterall.

No thanks, i have musics on my phone if i wanna play music..reasonable people don't use caller tunez

In 2013?

the idea is good but it is bn abused by our network operators for their selfish gains. I also noticed that even when did nt subscribed to it, they will sill use ur number and make ur caller listen to it as a means of advertising or setting trap for people to fall into it.

It has never been reasonable for me, as I don't derive any value from using caller tunes.