Original you are assured of quality and is more expensive also due to it is branded
Non original you buy at a risk of sub standard quality - will it spoil your phone while charge ? Will it sync properly with your PC ? All these possible issues you just need to evaluate whether is worth the risk for RM 40 savings ?
If you are concerned, do not use generic type

Anyway I have been using generic ( not Apple original) cables since the first iphone/ipad and has been using it through to ip3, 3s, 4 , 4s and ipad 2, new ipad - I do not have any issues. I got this generic for the first iphone and at that time I needed one urgently as spare and just pick it up at Spore . That period of time iphone was still new and there was no original for sale yet. I used it to charge . The original I keep it connected to my iMAC for syncing purposes
Infact for the new iphone 5, I am using also a generic type ( bought in Spore ) together with ipad mini as same situation original not available yet for sale on day one the ipad mini was on sale. It works well with the ipad mini and the iphone 5 . Will it spoil my iphone 5 - seriously no idea

I dont think a cable will cause such ; probably the desktop charger

ROCK cases has similar type
Some guy selling it at garage sales